diff --git a/src/hb-ot-layout-open-private.h b/src/hb-ot-layout-open-private.h
index 91aacfcf5b5e573c4fe3b4ec8699082aab825a0b..2dabffd6f26dd8b0705b59a7066bd4e570164985 100644
--- a/src/hb-ot-layout-open-private.h
+++ b/src/hb-ot-layout-open-private.h
@@ -420,7 +420,6 @@ struct TTCHeader
   private:
   /* OpenTypeFontFaces, in no particular order */
   DEFINE_OFFSET_ARRAY_TYPE (OffsetTable, offsetTable, numFonts);
-  /* XXX check version here? */
 
   private:
   Tag	ttcTag;		/* TrueType Collection ID string: 'ttcf' */