From 6ce3493f00a5c7395923273c50d0094cc2732d4a Mon Sep 17 00:00:00 2001
From: Chris Dodge <cdodge@edx.org>
Date: Mon, 4 Mar 2013 19:59:18 -0500
Subject: [PATCH] add comment

---
 common/lib/xmodule/xmodule/modulestore/mongo.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/common/lib/xmodule/xmodule/modulestore/mongo.py b/common/lib/xmodule/xmodule/modulestore/mongo.py
index b46c29b2bc..e2a4524188 100644
--- a/common/lib/xmodule/xmodule/modulestore/mongo.py
+++ b/common/lib/xmodule/xmodule/modulestore/mongo.py
@@ -66,6 +66,7 @@ class CachingDescriptorSystem(MakoDescriptorSystem):
         if json_data is None:
             module = self.modulestore.get_item(location)
             if module is not None:
+                # update our own cache after going to the DB to get cache miss
                 self.module_data.update(module.system.module_data)
             return module
         else: