--- openflow-2012-01-19.h	2015-07-23 09:54:16.904479352 -0700
+++ openflow-2012-02-29-2.h	2015-07-23 09:54:16.908479352 -0700
@@ -182,7 +182,7 @@
 struct ofp_switch_config {
     struct ofp_header header;
     uint16_t flags;             /* OFPC_* flags. */
-    uint16_t miss_send_len;     /* Max bytes of new flow that datapath
+    uint16_t miss_send_len;     /* Max bytes of packet that datapath
                                    should send to the controller. See
                                    ofp_controller_max_len for valid values.
                                    */
@@ -1190,7 +1190,7 @@
 
 /* Why is this packet being sent to the controller? */
 enum ofp_packet_in_reason {
-    OFPR_NO_MATCH    = 0,   /* No matching flow. */
+    OFPR_NO_MATCH    = 0,   /* No matching flow (table-miss flow entry). */
     OFPR_ACTION      = 1,   /* Action explicitly output to controller. */
     OFPR_INVALID_TTL = 2,   /* Packet has invalid TTL */
 };