--- openflow-2012-12-19.h	2015-07-23 09:54:17.224479365 -0700
+++ openflow-2013-03-26.h	2015-07-23 09:54:17.232479365 -0700
@@ -1183,7 +1183,10 @@
     uint8_t pad[2];
     struct ofp_match match;       /* Fields to match. Variable size. */
     /* The variable size and padded match is always followed by instructions. */
-    //struct ofp_instruction instructions[0]; /* Instruction set - 0 or more. */
+    //struct ofp_instruction instructions[0]; /* Instruction set - 0 or more.
+                                                 The length of the instruction
+                                                 set is inferred from the
+                                                 length field in the header. */
 };
 OFP_ASSERT(sizeof(struct ofp_flow_mod) == 56);
 
@@ -1224,8 +1227,8 @@
     uint8_t pad[4];
     struct ofp_action_header actions[0]; /* 0 or more actions associated with
                                             the bucket - The action list length
-                                            is inferred from the length field
-                                            in the header. */
+                                            is inferred from the length
+                                            of the bucket. */
 };
 OFP_ASSERT(sizeof(struct ofp_bucket) == 16);