diff --git a/HACKING.rst b/HACKING.rst
index d8850bab6f..7bebb44799 100644
--- a/HACKING.rst
+++ b/HACKING.rst
@@ -37,7 +37,6 @@ Nova Specific Commandments
 - [N324] Ensure that jsonutils.%(fun)s must be used instead of json.%(fun)s
 - [N325] str() and unicode() cannot be used on an exception.  Remove use or use six.text_type()
 - [N326] Translated messages cannot be concatenated.  String should be included in translated message.
-- [N327] assert_called_once() is not a valid method
 - [N328] Validate that LOG.info messages use _LI.
 - [N329] Validate that LOG.exception messages use _LE.
 - [N330] Validate that LOG.warning messages use _LW.