diff --git a/ChangeLog b/ChangeLog
index 3726adabe..823076a76 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -5,7 +5,8 @@
 
 2004-08-22  Pavel S. Shirshov  <pavelsh@mail.ru>
 
-	* m4/ri-gcc-warnings.m4: Typo fixes.
+	* m4/ri-gcc-warnings.m4: Using AC_HELP_STRING for more portable.
+	AS_HELP_STRING was introduced after autoconf 2.57+.
 	From Leonard den Ottolander <leonard * den.ottolander.nl>
 
 2004-08-18  Roland Illig  <roland.illig@gmx.de>