--- openflow-2013-07-09.h	2015-07-23 09:54:17.556479379 -0700
+++ openflow-2013-07-12.h	2015-07-23 09:54:17.560479379 -0700
@@ -1697,7 +1697,7 @@
 /* ofp_error_msg 'code' values for OFPET_BAD_ACTION.  'data' contains at least
  * the first 64 bytes of the failed request. */
 enum ofp_bad_action_code {
-    OFPBAC_BAD_TYPE           = 0,  /* Unknown action type. */
+    OFPBAC_BAD_TYPE           = 0,  /* Unknown or unsupported action type. */
     OFPBAC_BAD_LEN            = 1,  /* Length problem in actions. */
     OFPBAC_BAD_EXPERIMENTER   = 2,  /* Unknown experimenter id specified. */
     OFPBAC_BAD_EXP_TYPE       = 3,  /* Unknown action for experimenter id. */