diff --git a/docs/internals/contributing.txt b/docs/internals/contributing.txt
index b2efc2f684..f4955dc3ca 100644
--- a/docs/internals/contributing.txt
+++ b/docs/internals/contributing.txt
@@ -555,6 +555,7 @@ Model style
       follows (noting that these are not all required):
 
         * All database fields
+        * Custom manager attributes
         * ``class Meta``
         * ``def __unicode__()``
         * ``def __str__()``