diff --git a/lisp/progmodes/cc-defs.el b/lisp/progmodes/cc-defs.el
index 22e68a748d1..9af34b1b9b0 100644
--- a/lisp/progmodes/cc-defs.el
+++ b/lisp/progmodes/cc-defs.el
@@ -86,6 +86,8 @@
 
 ;;; Variables also used at compile time.
 
+;; IMPORTANT NOTE!  On changing `c-version', also update the "version
+;; header" near the beginning of cc-mode.el to match.
 (defconst c-version "5.35.2"
   "CC Mode version number.")
 
diff --git a/lisp/progmodes/cc-mode.el b/lisp/progmodes/cc-mode.el
index 76071d54f9c..2fe96152b33 100644
--- a/lisp/progmodes/cc-mode.el
+++ b/lisp/progmodes/cc-mode.el
@@ -12,7 +12,7 @@
 ;; Created:    a long, long, time ago. adapted from the original c-mode.el
 ;; Keywords:   c languages
 ;; The version header below is used for ELPA packaging.
-;; Version: 5.33.1
+;; Version: 5.35.2
 
 ;; This file is part of GNU Emacs.