--- openflow-2015-03-11.h	2015-07-23 09:54:18.124479402 -0700
+++ openflow-2015-03-24.h	2015-07-23 09:54:18.128479402 -0700
@@ -656,7 +656,7 @@
      *   - Exactly ((length + 7)/8*8 - length) (between 0 and 7) bytes of
      *     all-zero bytes
      * In summary, ofp_match is padded as needed, to make its overall size
-     * a multiple of 8, to preserve alignement in structures using it.
+     * a multiple of 8, to preserve alignment in structures using it.
      */
     uint8_t oxm_fields[0];     /* 0 or more OXM match fields */
     uint8_t pad[4];            /* Zero bytes - see above for sizing */