--- openflow-2013-01-18-3.h	2015-07-23 09:54:17.388479372 -0700
+++ openflow-2013-01-18-4.h	2015-07-23 09:54:17.392479372 -0700
@@ -2743,6 +2743,7 @@
 /* What changed about the controller role */
 enum ofp_controller_role_reason {
     OFPCRR_MASTER_REQUEST = 0,  /* Another controller asked to be master. */
+    OFPCRR_CONFIG         = 1,  /* Configuration changed on the switch. */
 };
 
 /* Role status event message. */