diff --git a/Dockerfile b/Dockerfile
index 4b3aa93..df093e0 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,3 +1,6 @@
 FROM python:3.7-slim
+# we are only installing the classic jupyter notebook, not jupyterlab
+# so you'll need to change your URLs from /lab to /tree
+# https://mybinder.readthedocs.io/en/latest/howto/user_interface.html#jupyterlab
 RUN pip install --no-cache notebook
 ENV HOME=/tmp