--- openflow-2014-05-08.h	2015-07-23 09:54:17.764479387 -0700
+++ openflow-2014-05-13.h	2015-07-23 09:54:17.768479387 -0700
@@ -3089,6 +3089,7 @@
     OFPCSR_CONTROLLER_ADDED   = 3,  /* New controller added. */
     OFPCSR_CONTROLLER_REMOVED = 4,  /* Controller removed from config. */
     OFPCSR_SHORT_ID           = 5,  /* Controller ID changed. */
+    OFPCSR_EXPERIMENTER       = 6,  /* Experimenter data changed. */
 };
 
 /* Body of OFPMP_CONTROLLER_STATUS reply message and body of async