--- openflow-2013-08-13-2.h	2015-07-23 09:54:17.620479381 -0700
+++ openflow-2013-09-13-2.h	2015-07-23 09:54:17.624479381 -0700
@@ -1772,6 +1772,7 @@
     OFPFMFC_BAD_FLAGS    = 7,   /* Unsupported or unknown flags. */
     OFPFMFC_CANT_SYNC    = 8,   /* Problem in table synchronisation. */
     OFPFMFC_BAD_PRIORITY = 9,   /* Unsupported priority value. */
+    OFPFMFC_IS_SYNC      = 10,  /* Synchronised flow entry is read only. */
 };
 
 /* ofp_error_msg 'code' values for OFPET_GROUP_MOD_FAILED.  'data' contains