--- openflow-2013-09-09.h	2015-07-23 09:54:17.608479381 -0700
+++ openflow-2013-08-13.h	2015-07-23 09:54:17.616479381 -0700
@@ -2706,8 +2706,8 @@
 struct ofp_flow_monitor_request {
     uint32_t monitor_id;        /* Controller-assigned ID for this monitor. */
     uint32_t out_port;          /* Required output port, if not OFPP_ANY. */
-    uint32_t out_group;         /* Required output port, if not OFPG_ANY. */
-    uint16_t flags;             /* OFFMF_*. */
+    uint32_t out_group;         /* Required group number, if not OFPG_ANY. */
+    uint16_t flags;             /* OFPFMF_*. */
     uint8_t table_id;           /* One table's ID or OFPTT_ALL (all tables). */
     uint8_t command;            /* One of OFPFMC_*. */
     struct ofp_match match;     /* Fields to match. Variable size. */