diff --git a/modules/github/__init__.py b/modules/github/__init__.py
index 8d36fb6e..f447c43d 100644
--- a/modules/github/__init__.py
+++ b/modules/github/__init__.py
@@ -423,6 +423,8 @@ class Module(ModuleManager.BaseModule):
     def _prevent_highlight(self, server, channel, s):
         for user in channel.users:
             if len(user.nickname) == 1:
+                # if we don't ignore 1-letter nicknames, the below while loop
+                # will fire indefininitely.
                 continue
 
             s_lower = server.irc_lower(s)