diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index b16d5606cc1..7cf587a7e98 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -2,7 +2,8 @@
 
 	* international/mule-cmds.el (encoded-string-description):
 	Rewritten.   Try pretty description for ISO 2022 escape sequences
-	only if CODING-SYSTEM is based on ISO 2022.
+	only if CODING-SYSTEM is based on ISO 2022.  Use uppercase letters
+	for hexadecimal format.
 
 2000-04-01  Dave Love  <fx@gnu.org>