diff --git a/Dockerfile b/Dockerfile
index 60776ea..c3da637 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -9,6 +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 toc2/toc2
 
 # Python 3
 RUN conda install -n python3 -c jjhelmus tensorflow=0.10.0