diff --git a/diagrams/onprem/certificates.py b/diagrams/onprem/certificates.py
index 920223ce..030e8a42 100644
--- a/diagrams/onprem/certificates.py
+++ b/diagrams/onprem/certificates.py
@@ -8,12 +8,12 @@ class _Certificates(_OnPrem):
     _icon_dir = "resources/onprem/certificates"
 
 
-class Certmanager(_Certificates):
-    _icon = "certmanager.png"
+class CertManager(_Certificates):
+    _icon = "cert-manager.png"
 
 
-class Letsencrypt(_Certificates):
-    _icon = "letsencrypt.png"
+class LetsEncrypt(_Certificates):
+    _icon = "lets-encrypt.png"
 
 
 # Aliases
diff --git a/diagrams/saas/chat.py b/diagrams/saas/chat.py
index ebdf0532..d4680a10 100644
--- a/diagrams/saas/chat.py
+++ b/diagrams/saas/chat.py
@@ -8,6 +8,10 @@ class _Chat(_Saas):
     _icon_dir = "resources/saas/chat"
 
 
+class RocketChat(_Chat):
+    _icon = "rocket-chat.png"
+
+
 class Slack(_Chat):
     _icon = "slack.png"
 
diff --git a/docs/nodes/onprem.md b/docs/nodes/onprem.md
index 464ec604..c95fff5e 100644
--- a/docs/nodes/onprem.md
+++ b/docs/nodes/onprem.md
@@ -28,8 +28,8 @@ Node classes list of onprem provider.
 
 ## onprem.certificates
 
-- **diagrams.onprem.certificates.Certmanager**
-- **diagrams.onprem.certificates.Letsencrypt**
+- **diagrams.onprem.certificates.CertManager**
+- **diagrams.onprem.certificates.LetsEncrypt**
 
 ## onprem.ci
 
diff --git a/docs/nodes/saas.md b/docs/nodes/saas.md
index e42f106a..70042603 100644
--- a/docs/nodes/saas.md
+++ b/docs/nodes/saas.md
@@ -21,6 +21,7 @@ Node classes list of saas provider.
 
 ## saas.chat
 
+- **diagrams.saas.chat.RocketChat**
 - **diagrams.saas.chat.Slack**
 - **diagrams.saas.chat.Telegram**
 
diff --git a/resources/onprem/certificates/certmanager.png b/resources/onprem/certificates/certmanager.png
deleted file mode 100644
index 72bd2754..00000000
Binary files a/resources/onprem/certificates/certmanager.png and /dev/null differ
diff --git a/resources/onprem/certificates/letsencrypt.png b/resources/onprem/certificates/letsencrypt.png
deleted file mode 100644
index 9963960f..00000000
Binary files a/resources/onprem/certificates/letsencrypt.png and /dev/null differ