diff --git a/Dockerfile b/Dockerfile
index b1049e7..adbba96 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -9,7 +9,7 @@ USER main
 RUN conda install -c jjhelmus tensorflow=0.10.0
 RUN conda install -c conda-forge jupyter_contrib_nbextensions
 RUN jupyter contrib nbextension install --user
-RUN jupyter nbextension enable usability/toc2/main
+RUN jupyter nbextension enable toc2/main
 
 # Python 3
 RUN conda install -n python3 -c jjhelmus tensorflow=0.10.0
diff --git a/README.md b/README.md
index 51c2612..adecad9 100644
--- a/README.md
+++ b/README.md
@@ -44,7 +44,7 @@ If you want to install the Jupyter extensions, run the following command:
 
 Then you can activate an extension, such as the Table of Contents (2) extension:
 
-    $ jupyter nbextension enable usability/toc2/main
+    $ jupyter nbextension enable toc2/main
 
 Finally, launch Jupyter: