diff --git a/README.md b/README.md
index 1f04eb05..e52570bb 100644
--- a/README.md
+++ b/README.md
@@ -85,7 +85,7 @@ $ jupyter labextension install jupyter-threejs
 If you are still using an old notebook version, ipyvolume and its dependend extension (widgetsnbextension) need to be enabled manually. If unsure, check which extensions are enabled:
 
 ```
-$ jupyter nbextention list
+$ jupyter nbextension list
 ```
 
 If not enabled, enable them:
diff --git a/docs/source/install.md b/docs/source/install.md
index b4ccaea1..91cb1b5d 100644
--- a/docs/source/install.md
+++ b/docs/source/install.md
@@ -32,7 +32,7 @@ $ jupyter labextension install jupyter-threejs
 If you are still using an old notebook version, ipyvolume and its dependend extension (widgetsnbextension) need to be enabled manually. If unsure, check which extensions are enabled:
 
 ```
-$ jupyter nbextention list
+$ jupyter nbextension list
 ```
 
 If not enabled, enable them:
diff --git a/js/src/extension.js b/js/src/extension.js
index 3738cd74..313d372d 100644
--- a/js/src/extension.js
+++ b/js/src/extension.js
@@ -14,7 +14,7 @@ if (window.require) {
     });
 }
 
-// Export the required load_ipython_extention
+// Export the required load_ipython_extension
 module.exports = {
     load_ipython_extension: function() {}
 };