--- openflow-2009-06-12.h	2015-07-23 09:54:15.660479301 -0700
+++ openflow-2009-06-12-2.h	2015-07-23 09:54:15.664479301 -0700
@@ -550,7 +550,8 @@
 /* Why did this flow expire? */
 enum ofp_flow_expired_reason {
     OFPER_IDLE_TIMEOUT,         /* Flow idle time exceeded idle_timeout. */
-    OFPER_HARD_TIMEOUT          /* Time exceeded hard_timeout. */
+    OFPER_HARD_TIMEOUT,         /* Time exceeded hard_timeout. */
+    OFPER_DELETE                /* Evicted by a DELETE flow mod. */
 };
 
 /* Flow expiration (datapath -> controller). */