diff --git a/docs/cluster.html b/docs/cluster.html
index 07853ed9..3d576a70 100644
--- a/docs/cluster.html
+++ b/docs/cluster.html
@@ -110,4 +110,4 @@
 <blockquote>
 <p>There is no depth limit of nesting. Feel free to create nested clusters as deep as you want.</p>
 </blockquote>
-</span></div></article></div><div class="docLastUpdate"><em>Last updated on 2020-2-3</em></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/node"><span class="arrow-prev">← </span><span>Nodes</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#basic">Basic</a></li><li><a href="#nested-clusters">Nested Clusters</a></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><a href="/" class="nav-home"><img src="/img/diagrams.ico" alt="Diagrams" width="66" height="58"/></a><div><h5>Docs</h5><a href="/docs/en/installation">Getting Started</a><a href="/docs/en/diagram">Guides</a></div><div><h5>More</h5><a href="https://github.com/mingrammer/diagrams">GitHub</a><a class="github-button" data-icon="octicon-star" data-count-href="/mingrammer/diagrams/stargazers" data-show-count="true" data-count-aria-label="# stargazers on GitHub" aria-label="Star this project on GitHub">Star</a></div></section><section class="copyright">Copyright © 2020 mingrammer</section></footer></div></body></html>
\ No newline at end of file
+</span></div></article></div><div class="docLastUpdate"><em>Last updated on 2/3/2020</em></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/node"><span class="arrow-prev">← </span><span>Nodes</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#basic">Basic</a></li><li><a href="#nested-clusters">Nested Clusters</a></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><a href="/" class="nav-home"><img src="/img/diagrams.ico" alt="Diagrams" width="66" height="58"/></a><div><h5>Docs</h5><a href="/docs/en/installation">Getting Started</a><a href="/docs/en/diagram">Guides</a></div><div><h5>More</h5><a href="https://github.com/mingrammer/diagrams">GitHub</a><a class="github-button" data-icon="octicon-star" data-count-href="/mingrammer/diagrams/stargazers" data-show-count="true" data-count-aria-label="# stargazers on GitHub" aria-label="Star this project on GitHub">Star</a></div></section><section class="copyright">Copyright © 2020 mingrammer</section></footer></div></body></html>
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diff --git a/docs/cluster/index.html b/docs/cluster/index.html
index 07853ed9..3d576a70 100644
--- a/docs/cluster/index.html
+++ b/docs/cluster/index.html
@@ -110,4 +110,4 @@
 <blockquote>
 <p>There is no depth limit of nesting. Feel free to create nested clusters as deep as you want.</p>
 </blockquote>
-</span></div></article></div><div class="docLastUpdate"><em>Last updated on 2020-2-3</em></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/node"><span class="arrow-prev">← </span><span>Nodes</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#basic">Basic</a></li><li><a href="#nested-clusters">Nested Clusters</a></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><a href="/" class="nav-home"><img src="/img/diagrams.ico" alt="Diagrams" width="66" height="58"/></a><div><h5>Docs</h5><a href="/docs/en/installation">Getting Started</a><a href="/docs/en/diagram">Guides</a></div><div><h5>More</h5><a href="https://github.com/mingrammer/diagrams">GitHub</a><a class="github-button" data-icon="octicon-star" data-count-href="/mingrammer/diagrams/stargazers" data-show-count="true" data-count-aria-label="# stargazers on GitHub" aria-label="Star this project on GitHub">Star</a></div></section><section class="copyright">Copyright © 2020 mingrammer</section></footer></div></body></html>
\ No newline at end of file
+</span></div></article></div><div class="docLastUpdate"><em>Last updated on 2/3/2020</em></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/node"><span class="arrow-prev">← </span><span>Nodes</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#basic">Basic</a></li><li><a href="#nested-clusters">Nested Clusters</a></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><a href="/" class="nav-home"><img src="/img/diagrams.ico" alt="Diagrams" width="66" height="58"/></a><div><h5>Docs</h5><a href="/docs/en/installation">Getting Started</a><a href="/docs/en/diagram">Guides</a></div><div><h5>More</h5><a href="https://github.com/mingrammer/diagrams">GitHub</a><a class="github-button" data-icon="octicon-star" data-count-href="/mingrammer/diagrams/stargazers" data-show-count="true" data-count-aria-label="# stargazers on GitHub" aria-label="Star this project on GitHub">Star</a></div></section><section class="copyright">Copyright © 2020 mingrammer</section></footer></div></body></html>
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diff --git a/docs/diagram.html b/docs/diagram.html
index a50aef58..2bb72260 100644
--- a/docs/diagram.html
+++ b/docs/diagram.html
@@ -86,4 +86,4 @@
 <span class="hljs-keyword">with</span> Diagram(<span class="hljs-string">"Simple Diagram"</span>, show=<span class="hljs-literal">False</span>):
     EC2(<span class="hljs-string">"web"</span>)
 </code></pre>
-</span></div></article></div><div class="docLastUpdate"><em>Last updated on 2020-2-3</em></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/examples"><span class="arrow-prev">← </span><span>Examples</span></a><a class="docs-next button" href="/docs/node"><span>Nodes</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#basic">Basic</a></li><li><a href="#options">Options</a></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><a href="/" class="nav-home"><img src="/img/diagrams.ico" alt="Diagrams" width="66" height="58"/></a><div><h5>Docs</h5><a href="/docs/en/installation">Getting Started</a><a href="/docs/en/diagram">Guides</a></div><div><h5>More</h5><a href="https://github.com/mingrammer/diagrams">GitHub</a><a class="github-button" data-icon="octicon-star" data-count-href="/mingrammer/diagrams/stargazers" data-show-count="true" data-count-aria-label="# stargazers on GitHub" aria-label="Star this project on GitHub">Star</a></div></section><section class="copyright">Copyright © 2020 mingrammer</section></footer></div></body></html>
\ No newline at end of file
+</span></div></article></div><div class="docLastUpdate"><em>Last updated on 2/3/2020</em></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/examples"><span class="arrow-prev">← </span><span>Examples</span></a><a class="docs-next button" href="/docs/node"><span>Nodes</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#basic">Basic</a></li><li><a href="#options">Options</a></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><a href="/" class="nav-home"><img src="/img/diagrams.ico" alt="Diagrams" width="66" height="58"/></a><div><h5>Docs</h5><a href="/docs/en/installation">Getting Started</a><a href="/docs/en/diagram">Guides</a></div><div><h5>More</h5><a href="https://github.com/mingrammer/diagrams">GitHub</a><a class="github-button" data-icon="octicon-star" data-count-href="/mingrammer/diagrams/stargazers" data-show-count="true" data-count-aria-label="# stargazers on GitHub" aria-label="Star this project on GitHub">Star</a></div></section><section class="copyright">Copyright © 2020 mingrammer</section></footer></div></body></html>
\ No newline at end of file
diff --git a/docs/diagram/index.html b/docs/diagram/index.html
index a50aef58..2bb72260 100644
--- a/docs/diagram/index.html
+++ b/docs/diagram/index.html
@@ -86,4 +86,4 @@
 <span class="hljs-keyword">with</span> Diagram(<span class="hljs-string">"Simple Diagram"</span>, show=<span class="hljs-literal">False</span>):
     EC2(<span class="hljs-string">"web"</span>)
 </code></pre>
-</span></div></article></div><div class="docLastUpdate"><em>Last updated on 2020-2-3</em></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/examples"><span class="arrow-prev">← </span><span>Examples</span></a><a class="docs-next button" href="/docs/node"><span>Nodes</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#basic">Basic</a></li><li><a href="#options">Options</a></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><a href="/" class="nav-home"><img src="/img/diagrams.ico" alt="Diagrams" width="66" height="58"/></a><div><h5>Docs</h5><a href="/docs/en/installation">Getting Started</a><a href="/docs/en/diagram">Guides</a></div><div><h5>More</h5><a href="https://github.com/mingrammer/diagrams">GitHub</a><a class="github-button" data-icon="octicon-star" data-count-href="/mingrammer/diagrams/stargazers" data-show-count="true" data-count-aria-label="# stargazers on GitHub" aria-label="Star this project on GitHub">Star</a></div></section><section class="copyright">Copyright © 2020 mingrammer</section></footer></div></body></html>
\ No newline at end of file
+</span></div></article></div><div class="docLastUpdate"><em>Last updated on 2/3/2020</em></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/examples"><span class="arrow-prev">← </span><span>Examples</span></a><a class="docs-next button" href="/docs/node"><span>Nodes</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#basic">Basic</a></li><li><a href="#options">Options</a></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><a href="/" class="nav-home"><img src="/img/diagrams.ico" alt="Diagrams" width="66" height="58"/></a><div><h5>Docs</h5><a href="/docs/en/installation">Getting Started</a><a href="/docs/en/diagram">Guides</a></div><div><h5>More</h5><a href="https://github.com/mingrammer/diagrams">GitHub</a><a class="github-button" data-icon="octicon-star" data-count-href="/mingrammer/diagrams/stargazers" data-show-count="true" data-count-aria-label="# stargazers on GitHub" aria-label="Star this project on GitHub">Star</a></div></section><section class="copyright">Copyright © 2020 mingrammer</section></footer></div></body></html>
\ No newline at end of file
diff --git a/docs/examples.html b/docs/examples.html
index 39e1a50d..cad820a9 100644
--- a/docs/examples.html
+++ b/docs/examples.html
@@ -161,4 +161,4 @@
     pubsub &gt;&gt; flow
 </code></pre>
 <p><img src="/img/message_collecting_diagram.png" alt="message collecting diagram"></p>
-</span></div></article></div><div class="docLastUpdate"><em>Last updated on 2020-2-3</em></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/installation"><span class="arrow-prev">← </span><span>Installation</span></a><a class="docs-next button" href="/docs/diagram"><span>Diagrams</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#grouped-workers">Grouped Workers</a></li><li><a href="#clustered-web-services">Clustered Web Services</a></li><li><a href="#event-processing">Event Processing</a></li><li><a href="#message-collecting-system">Message Collecting System</a></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><a href="/" class="nav-home"><img src="/img/diagrams.ico" alt="Diagrams" width="66" height="58"/></a><div><h5>Docs</h5><a href="/docs/en/installation">Getting Started</a><a href="/docs/en/diagram">Guides</a></div><div><h5>More</h5><a href="https://github.com/mingrammer/diagrams">GitHub</a><a class="github-button" data-icon="octicon-star" data-count-href="/mingrammer/diagrams/stargazers" data-show-count="true" data-count-aria-label="# stargazers on GitHub" aria-label="Star this project on GitHub">Star</a></div></section><section class="copyright">Copyright © 2020 mingrammer</section></footer></div></body></html>
\ No newline at end of file
+</span></div></article></div><div class="docLastUpdate"><em>Last updated on 2/3/2020</em></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/installation"><span class="arrow-prev">← </span><span>Installation</span></a><a class="docs-next button" href="/docs/diagram"><span>Diagrams</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#grouped-workers">Grouped Workers</a></li><li><a href="#clustered-web-services">Clustered Web Services</a></li><li><a href="#event-processing">Event Processing</a></li><li><a href="#message-collecting-system">Message Collecting System</a></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><a href="/" class="nav-home"><img src="/img/diagrams.ico" alt="Diagrams" width="66" height="58"/></a><div><h5>Docs</h5><a href="/docs/en/installation">Getting Started</a><a href="/docs/en/diagram">Guides</a></div><div><h5>More</h5><a href="https://github.com/mingrammer/diagrams">GitHub</a><a class="github-button" data-icon="octicon-star" data-count-href="/mingrammer/diagrams/stargazers" data-show-count="true" data-count-aria-label="# stargazers on GitHub" aria-label="Star this project on GitHub">Star</a></div></section><section class="copyright">Copyright © 2020 mingrammer</section></footer></div></body></html>
\ No newline at end of file
diff --git a/docs/examples/index.html b/docs/examples/index.html
index 39e1a50d..cad820a9 100644
--- a/docs/examples/index.html
+++ b/docs/examples/index.html
@@ -161,4 +161,4 @@
     pubsub &gt;&gt; flow
 </code></pre>
 <p><img src="/img/message_collecting_diagram.png" alt="message collecting diagram"></p>
-</span></div></article></div><div class="docLastUpdate"><em>Last updated on 2020-2-3</em></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/installation"><span class="arrow-prev">← </span><span>Installation</span></a><a class="docs-next button" href="/docs/diagram"><span>Diagrams</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#grouped-workers">Grouped Workers</a></li><li><a href="#clustered-web-services">Clustered Web Services</a></li><li><a href="#event-processing">Event Processing</a></li><li><a href="#message-collecting-system">Message Collecting System</a></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><a href="/" class="nav-home"><img src="/img/diagrams.ico" alt="Diagrams" width="66" height="58"/></a><div><h5>Docs</h5><a href="/docs/en/installation">Getting Started</a><a href="/docs/en/diagram">Guides</a></div><div><h5>More</h5><a href="https://github.com/mingrammer/diagrams">GitHub</a><a class="github-button" data-icon="octicon-star" data-count-href="/mingrammer/diagrams/stargazers" data-show-count="true" data-count-aria-label="# stargazers on GitHub" aria-label="Star this project on GitHub">Star</a></div></section><section class="copyright">Copyright © 2020 mingrammer</section></footer></div></body></html>
\ No newline at end of file
+</span></div></article></div><div class="docLastUpdate"><em>Last updated on 2/3/2020</em></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/installation"><span class="arrow-prev">← </span><span>Installation</span></a><a class="docs-next button" href="/docs/diagram"><span>Diagrams</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#grouped-workers">Grouped Workers</a></li><li><a href="#clustered-web-services">Clustered Web Services</a></li><li><a href="#event-processing">Event Processing</a></li><li><a href="#message-collecting-system">Message Collecting System</a></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><a href="/" class="nav-home"><img src="/img/diagrams.ico" alt="Diagrams" width="66" height="58"/></a><div><h5>Docs</h5><a href="/docs/en/installation">Getting Started</a><a href="/docs/en/diagram">Guides</a></div><div><h5>More</h5><a href="https://github.com/mingrammer/diagrams">GitHub</a><a class="github-button" data-icon="octicon-star" data-count-href="/mingrammer/diagrams/stargazers" data-show-count="true" data-count-aria-label="# stargazers on GitHub" aria-label="Star this project on GitHub">Star</a></div></section><section class="copyright">Copyright © 2020 mingrammer</section></footer></div></body></html>
\ No newline at end of file
diff --git a/docs/installation.html b/docs/installation.html
index 36a0dce2..79308dfe 100644
--- a/docs/installation.html
+++ b/docs/installation.html
@@ -55,7 +55,17 @@
               }
             });
         </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><h1 id="__docusaurus" class="postHeaderTitle">Installation</h1></header><article><div><span><p>It uses <a href="https://www.graphviz.org/">Graphviz</a> to render the diagram, so you need to <a href="https://graphviz.gitlab.io/download/">install Graphviz</a> to use <strong>diagrams</strong>. After installing graphviz (or already have it), install the <strong>diagrams</strong>.</p>
-<pre><code class="hljs css language-shell"><span class="hljs-meta">$</span><span class="bash"> pip install diagrams</span>
+<blockquote>
+<p>macOS users can download the Graphviz via <code>brew install graphviz</code> if you're using <a href="https://brew.sh">Homebrew</a>.</p>
+</blockquote>
+<pre><code class="hljs css language-shell"><span class="hljs-meta">#</span><span class="bash"> using pip (pip3)</span>
+<span class="hljs-meta">$</span><span class="bash"> pip install diagrams</span>
+<span class="hljs-meta">
+#</span><span class="bash"> using pipenv</span>
+<span class="hljs-meta">$</span><span class="bash"> pipenv install diagrams</span>
+<span class="hljs-meta">
+#</span><span class="bash"> using poetry</span>
+<span class="hljs-meta">$</span><span class="bash"> poetry add diagrams</span>
 </code></pre>
 <h2><a class="anchor" aria-hidden="true" id="quick-start"></a><a href="#quick-start" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Quick Start</h2>
 <pre><code class="hljs css language-python"><span class="hljs-comment"># diagram.py</span>
@@ -74,4 +84,4 @@
 <p>It will be saved as <code>web_service.png</code> on your working directory.</p>
 <h2><a class="anchor" aria-hidden="true" id="next"></a><a href="#next" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Next</h2>
 <p>See more <a href="/docs/examples">Examples</a> or see <a href="/docs/diagram">Guides</a> page for more details.</p>
-</span></div></article></div><div class="docLastUpdate"><em>Last updated on 2020-2-3</em></div><div class="docs-prevnext"><a class="docs-next button" href="/docs/examples"><span>Examples</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#quick-start">Quick Start</a></li><li><a href="#next">Next</a></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><a href="/" class="nav-home"><img src="/img/diagrams.ico" alt="Diagrams" width="66" height="58"/></a><div><h5>Docs</h5><a href="/docs/en/installation">Getting Started</a><a href="/docs/en/diagram">Guides</a></div><div><h5>More</h5><a href="https://github.com/mingrammer/diagrams">GitHub</a><a class="github-button" data-icon="octicon-star" data-count-href="/mingrammer/diagrams/stargazers" data-show-count="true" data-count-aria-label="# stargazers on GitHub" aria-label="Star this project on GitHub">Star</a></div></section><section class="copyright">Copyright © 2020 mingrammer</section></footer></div></body></html>
\ No newline at end of file
+</span></div></article></div><div class="docLastUpdate"><em>Last updated on 2/3/2020</em></div><div class="docs-prevnext"><a class="docs-next button" href="/docs/examples"><span>Examples</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#quick-start">Quick Start</a></li><li><a href="#next">Next</a></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><a href="/" class="nav-home"><img src="/img/diagrams.ico" alt="Diagrams" width="66" height="58"/></a><div><h5>Docs</h5><a href="/docs/en/installation">Getting Started</a><a href="/docs/en/diagram">Guides</a></div><div><h5>More</h5><a href="https://github.com/mingrammer/diagrams">GitHub</a><a class="github-button" data-icon="octicon-star" data-count-href="/mingrammer/diagrams/stargazers" data-show-count="true" data-count-aria-label="# stargazers on GitHub" aria-label="Star this project on GitHub">Star</a></div></section><section class="copyright">Copyright © 2020 mingrammer</section></footer></div></body></html>
\ No newline at end of file
diff --git a/docs/installation/index.html b/docs/installation/index.html
index 36a0dce2..79308dfe 100644
--- a/docs/installation/index.html
+++ b/docs/installation/index.html
@@ -55,7 +55,17 @@
               }
             });
         </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><h1 id="__docusaurus" class="postHeaderTitle">Installation</h1></header><article><div><span><p>It uses <a href="https://www.graphviz.org/">Graphviz</a> to render the diagram, so you need to <a href="https://graphviz.gitlab.io/download/">install Graphviz</a> to use <strong>diagrams</strong>. After installing graphviz (or already have it), install the <strong>diagrams</strong>.</p>
-<pre><code class="hljs css language-shell"><span class="hljs-meta">$</span><span class="bash"> pip install diagrams</span>
+<blockquote>
+<p>macOS users can download the Graphviz via <code>brew install graphviz</code> if you're using <a href="https://brew.sh">Homebrew</a>.</p>
+</blockquote>
+<pre><code class="hljs css language-shell"><span class="hljs-meta">#</span><span class="bash"> using pip (pip3)</span>
+<span class="hljs-meta">$</span><span class="bash"> pip install diagrams</span>
+<span class="hljs-meta">
+#</span><span class="bash"> using pipenv</span>
+<span class="hljs-meta">$</span><span class="bash"> pipenv install diagrams</span>
+<span class="hljs-meta">
+#</span><span class="bash"> using poetry</span>
+<span class="hljs-meta">$</span><span class="bash"> poetry add diagrams</span>
 </code></pre>
 <h2><a class="anchor" aria-hidden="true" id="quick-start"></a><a href="#quick-start" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Quick Start</h2>
 <pre><code class="hljs css language-python"><span class="hljs-comment"># diagram.py</span>
@@ -74,4 +84,4 @@
 <p>It will be saved as <code>web_service.png</code> on your working directory.</p>
 <h2><a class="anchor" aria-hidden="true" id="next"></a><a href="#next" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Next</h2>
 <p>See more <a href="/docs/examples">Examples</a> or see <a href="/docs/diagram">Guides</a> page for more details.</p>
-</span></div></article></div><div class="docLastUpdate"><em>Last updated on 2020-2-3</em></div><div class="docs-prevnext"><a class="docs-next button" href="/docs/examples"><span>Examples</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#quick-start">Quick Start</a></li><li><a href="#next">Next</a></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><a href="/" class="nav-home"><img src="/img/diagrams.ico" alt="Diagrams" width="66" height="58"/></a><div><h5>Docs</h5><a href="/docs/en/installation">Getting Started</a><a href="/docs/en/diagram">Guides</a></div><div><h5>More</h5><a href="https://github.com/mingrammer/diagrams">GitHub</a><a class="github-button" data-icon="octicon-star" data-count-href="/mingrammer/diagrams/stargazers" data-show-count="true" data-count-aria-label="# stargazers on GitHub" aria-label="Star this project on GitHub">Star</a></div></section><section class="copyright">Copyright © 2020 mingrammer</section></footer></div></body></html>
\ No newline at end of file
+</span></div></article></div><div class="docLastUpdate"><em>Last updated on 2/3/2020</em></div><div class="docs-prevnext"><a class="docs-next button" href="/docs/examples"><span>Examples</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#quick-start">Quick Start</a></li><li><a href="#next">Next</a></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><a href="/" class="nav-home"><img src="/img/diagrams.ico" alt="Diagrams" width="66" height="58"/></a><div><h5>Docs</h5><a href="/docs/en/installation">Getting Started</a><a href="/docs/en/diagram">Guides</a></div><div><h5>More</h5><a href="https://github.com/mingrammer/diagrams">GitHub</a><a class="github-button" data-icon="octicon-star" data-count-href="/mingrammer/diagrams/stargazers" data-show-count="true" data-count-aria-label="# stargazers on GitHub" aria-label="Star this project on GitHub">Star</a></div></section><section class="copyright">Copyright © 2020 mingrammer</section></footer></div></body></html>
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diff --git a/docs/node.html b/docs/node.html
index 59d86ca6..aa5b973d 100644
--- a/docs/node.html
+++ b/docs/node.html
@@ -144,4 +144,4 @@
 <blockquote>
 <p>You can't connect two <strong>lists</strong> directly because shift/arithmetic operations between lists are not allowed in Python.</p>
 </blockquote>
-</span></div></article></div><div class="docLastUpdate"><em>Last updated on 2020-2-3</em></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/diagram"><span class="arrow-prev">← </span><span>Diagrams</span></a><a class="docs-next button" href="/docs/cluster"><span>Clusters</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#basic">Basic</a></li><li><a href="#data-flow">Data Flow</a></li><li><a href="#group-data-flow">Group Data Flow</a></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><a href="/" class="nav-home"><img src="/img/diagrams.ico" alt="Diagrams" width="66" height="58"/></a><div><h5>Docs</h5><a href="/docs/en/installation">Getting Started</a><a href="/docs/en/diagram">Guides</a></div><div><h5>More</h5><a href="https://github.com/mingrammer/diagrams">GitHub</a><a class="github-button" data-icon="octicon-star" data-count-href="/mingrammer/diagrams/stargazers" data-show-count="true" data-count-aria-label="# stargazers on GitHub" aria-label="Star this project on GitHub">Star</a></div></section><section class="copyright">Copyright © 2020 mingrammer</section></footer></div></body></html>
\ No newline at end of file
+</span></div></article></div><div class="docLastUpdate"><em>Last updated on 2/3/2020</em></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/diagram"><span class="arrow-prev">← </span><span>Diagrams</span></a><a class="docs-next button" href="/docs/cluster"><span>Clusters</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#basic">Basic</a></li><li><a href="#data-flow">Data Flow</a></li><li><a href="#group-data-flow">Group Data Flow</a></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><a href="/" class="nav-home"><img src="/img/diagrams.ico" alt="Diagrams" width="66" height="58"/></a><div><h5>Docs</h5><a href="/docs/en/installation">Getting Started</a><a href="/docs/en/diagram">Guides</a></div><div><h5>More</h5><a href="https://github.com/mingrammer/diagrams">GitHub</a><a class="github-button" data-icon="octicon-star" data-count-href="/mingrammer/diagrams/stargazers" data-show-count="true" data-count-aria-label="# stargazers on GitHub" aria-label="Star this project on GitHub">Star</a></div></section><section class="copyright">Copyright © 2020 mingrammer</section></footer></div></body></html>
\ No newline at end of file
diff --git a/docs/node/index.html b/docs/node/index.html
index 59d86ca6..aa5b973d 100644
--- a/docs/node/index.html
+++ b/docs/node/index.html
@@ -144,4 +144,4 @@
 <blockquote>
 <p>You can't connect two <strong>lists</strong> directly because shift/arithmetic operations between lists are not allowed in Python.</p>
 </blockquote>
-</span></div></article></div><div class="docLastUpdate"><em>Last updated on 2020-2-3</em></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/diagram"><span class="arrow-prev">← </span><span>Diagrams</span></a><a class="docs-next button" href="/docs/cluster"><span>Clusters</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#basic">Basic</a></li><li><a href="#data-flow">Data Flow</a></li><li><a href="#group-data-flow">Group Data Flow</a></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><a href="/" class="nav-home"><img src="/img/diagrams.ico" alt="Diagrams" width="66" height="58"/></a><div><h5>Docs</h5><a href="/docs/en/installation">Getting Started</a><a href="/docs/en/diagram">Guides</a></div><div><h5>More</h5><a href="https://github.com/mingrammer/diagrams">GitHub</a><a class="github-button" data-icon="octicon-star" data-count-href="/mingrammer/diagrams/stargazers" data-show-count="true" data-count-aria-label="# stargazers on GitHub" aria-label="Star this project on GitHub">Star</a></div></section><section class="copyright">Copyright © 2020 mingrammer</section></footer></div></body></html>
\ No newline at end of file
+</span></div></article></div><div class="docLastUpdate"><em>Last updated on 2/3/2020</em></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/diagram"><span class="arrow-prev">← </span><span>Diagrams</span></a><a class="docs-next button" href="/docs/cluster"><span>Clusters</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#basic">Basic</a></li><li><a href="#data-flow">Data Flow</a></li><li><a href="#group-data-flow">Group Data Flow</a></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><a href="/" class="nav-home"><img src="/img/diagrams.ico" alt="Diagrams" width="66" height="58"/></a><div><h5>Docs</h5><a href="/docs/en/installation">Getting Started</a><a href="/docs/en/diagram">Guides</a></div><div><h5>More</h5><a href="https://github.com/mingrammer/diagrams">GitHub</a><a class="github-button" data-icon="octicon-star" data-count-href="/mingrammer/diagrams/stargazers" data-show-count="true" data-count-aria-label="# stargazers on GitHub" aria-label="Star this project on GitHub">Star</a></div></section><section class="copyright">Copyright © 2020 mingrammer</section></footer></div></body></html>
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