--- openflow-2011-02-22.h	2015-07-23 09:54:16.512479336 -0700
+++ openflow-2011-03-18-2.h	2015-07-23 09:54:16.520479336 -0700
@@ -831,8 +831,8 @@
     uint8_t type;                 /* One of OFPGT_*. */
     uint8_t pad;                  /* Pad to 64 bits. */
     uint32_t group_id;            /* Group identifier. */
-    struct ofp_bucket buckets[0]; /* The bucket length is inferred from the
-                                     length field in the header. */
+    struct ofp_bucket buckets[0]; /* The length of the bucket array is inferred
+                                     from the length field in the header. */
 };
 OFP_ASSERT(sizeof(struct ofp_group_mod) == 16);