diff --git a/docker/r-dsci-100-grading/Dockerfile b/docker/r-dsci-100-grading/Dockerfile
index e99f3e2..a6bc2ad 100644
--- a/docker/r-dsci-100-grading/Dockerfile
+++ b/docker/r-dsci-100-grading/Dockerfile
@@ -4,13 +4,15 @@ FROM ubcdsci/r-dsci-100:latest
 
 LABEL maintainer="Tiffany Timbers <tiffany.timbers@stat.ubc.ca>"
 
+# install the rise slides extension
 RUN mamba install --quiet --yes "rise"
 
-# install nbgrader and rise extension
+# install nbgrader
 RUN mamba install --quiet --yes "nbgrader=0.7.1" \
     && jupyter nbextension install --sys-prefix --py nbgrader --overwrite \
     && jupyter nbextension enable --sys-prefix --py nbgrader \
     && jupyter serverextension enable --sys-prefix --py nbgrader 
 
+# Clean the cache
 RUN mamba clean --all -f -y 
 
diff --git a/docker/r-dsci-100/Dockerfile b/docker/r-dsci-100/Dockerfile
index b4e83d5..d7ac0c2 100644
--- a/docker/r-dsci-100/Dockerfile
+++ b/docker/r-dsci-100/Dockerfile
@@ -39,6 +39,6 @@ RUN pip install git+https://github.com/data-8/nbgitpuller@c23461d4f7ce47ec4e0d2b
   && jupyter labextension install @techrah/text-shortcuts \
   && jupyter lab build  
 
-#COPY rm-merge-shortcut.py /tmp/user-settings/\@jupyterlab/shortcuts-extension/shortcuts.jupyterlab-settings
+# Install the extension to remove the shift+M merge shortcut
 RUN mkdir -p /home/${NB_USER}/.jupyter/lab/user-settings/\@jupyterlab/shortcuts-extension
 COPY rm-merge-shortcut.py /home/${NB_USER}/.jupyter/lab/user-settings/\@jupyterlab/shortcuts-extension/shortcuts.jupyterlab-settings