Add notes on changing password when using OpenShift templates.

examples/openshift/README.md

@@ -191,6 +191,29 @@ Start up the notebook again.
 oc scale dc/mynotebook --replicas 1
 ```
 
+Changing the Notebook Password
+------------------------------
+
+The password for the notebook is supplied as a template parameter, or if not supplied will be automatically generated by the template. It will be passed into the container through an environment variable.
+
+If you want to change the password, you can do so by editing the environment variable on the deployment configuration.
+
+```
+oc set env dc/mynotebook JUPYTER_NOTEBOOK_PASSWORD=mypassword
+```
+
+This will trigger a new deployment so ensure you have downloaded any work if not using a persistent volume.
+
+If using a persistent volume, you could instead setup a password in the file:
+
+```
+/home/jovyan/work/.jupyter/jupyter_notebook_config.py
+```
+
+as per guidelines in:
+
+* https://jupyter-notebook.readthedocs.io/en/stable/public_server.html
+
 Deploying from a Custom Image
 -----------------------------