--- openflow-2009-11-23.h	2015-07-23 09:54:15.768479306 -0700
+++ openflow-2009-10-12.h	2015-07-23 09:54:15.772479306 -0700
@@ -729,8 +729,9 @@
     char hw_desc[DESC_STR_LEN];        /* Hardware description. */
     char sw_desc[DESC_STR_LEN];        /* Software description. */
     char serial_num[SERIAL_NUM_LEN];   /* Serial number. */
+    char dp_desc[DESC_STR_LEN];        /* Human readable description of datapath. */
 };
-OFP_ASSERT(sizeof(struct ofp_desc_stats) == 800);
+OFP_ASSERT(sizeof(struct ofp_desc_stats) == 1056);
 
 /* Body for ofp_stats_request of type OFPST_FLOW. */
 struct ofp_flow_stats_request {