Clarified based on @shnayder's comment

README.md

@@ -124,8 +124,8 @@ And `rake` will start up your Django project on the localhost, port 8001. To
 view your running project, type `127.0.0.1:8001` into your web browser, and
 you should see edX in all its glory!
 
-If you need to run old XML-only LMS (which doesn't use the database), run this
-instead:
+If you need to run old XML-only LMS (which doesn't use the mongo database for
+course content), run this instead:
 
     $ rake lms