diff --git a/procat2/middleware.py b/procat2/middleware.py
index 4b8ed1d..db47004 100644
--- a/procat2/middleware.py
+++ b/procat2/middleware.py
@@ -1,7 +1,18 @@
-# https://docs.djangoproject.com/en/2.1/topics/http/middleware/
-# https://stackoverflow.com/questions/12596722/django-identify-app-in-template
+"""
+Middleware classes used throughout the project.
+
+See https://docs.djangoproject.com/en/2.1/topics/http/middleware/
+"""
 
 class SetApplicationName(object):
+    """
+    Set request.current_app to the name of the app the current
+    view belongs to.  This ends up being the first component
+    of the package name.
+
+    See:
+    https://stackoverflow.com/questions/12596722/django-identify-app-in-template
+    """
 
     def __init__(self, get_response):
         self.get_response = get_response