diff --git a/1-Introduction/01-defining-data-science/notebook.ipynb b/1-Introduction/01-defining-data-science/notebook.ipynb
index bf79949e..1d1850e3 100644
--- a/1-Introduction/01-defining-data-science/notebook.ipynb
+++ b/1-Introduction/01-defining-data-science/notebook.ipynb
@@ -70,7 +70,7 @@
     "\r\n",
     "The next step is to convert the data into the form suitable for processing. In our case, we have downloaded HTML source code from the page, and we need to convert it into plain text.\r\n",
     "\r\n",
-    "There are many ways this can be done. We will use the simplest build-in [HTMLParser](https://docs.python.org/3/library/html.parser.html) object from Python. We need to subclass the `HTMLParser` class and define the code that will collect all text inside HTML tags, except `<script>` and `<style>` tags."
+    "There are many ways this can be done. We will use the simplest built-in [HTMLParser](https://docs.python.org/3/library/html.parser.html) object from Python. We need to subclass the `HTMLParser` class and define the code that will collect all text inside HTML tags, except `<script>` and `<style>` tags."
    ],
    "metadata": {}
   },
@@ -416,4 +416,4 @@
  },
  "nbformat": 4,
  "nbformat_minor": 2
-}
\ No newline at end of file
+}