-;; This function is designed to be called as the FUNCTION in a MATCHER in
-;; font-lock-syntactic-keywords, and it always returns NIL (to inhibit
-;; repeated calls from font-lock: See elisp info page "Search-based
-;; Fontification"). It also gets called, with a bit of glue, from
-;; after-change-functions when font-lock isn't active. Point is left
-;; "undefined" after this function exits. THE BUFFER SHOULD HAVE BEEN
-;; WIDENED, AND ANY PRECIOUS MATCH-DATA SAVED BEFORE CALLING THIS ROUTINE.
+;; This function is designed to be called as the FUNCTION in a MATCHER
+;; in font-lock-syntactic-keywords, and it always returns NIL (to
+;; inhibit repeated calls from font-lock: See elisp info page
+;; "Search-based Fontification"). (2015-11-24: CC Mode doesn't use
+;; `font-lock-syntactic-keywords' and hasn't done for a very long
+;; time, if ever. ACM.) This function gets called, with a bit of
+;; glue, from after-change-functions whether or not font-lock is
+;; active. Point is left "undefined" after this function exits. THE
+;; BUFFER SHOULD HAVE BEEN WIDENED, AND ANY PRECIOUS MATCH-DATA SAVED
+;; BEFORE CALLING THIS ROUTINE.