diff --git a/src/ChangeLog b/src/ChangeLog
index a979af1050dfe9d698b43d1105b768bf45ddab4f..be3925c088eac37ac50f7f01c55bd19aece50c5e 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,6 +1,7 @@
 2011-04-09  Paul Eggert  <eggert@cs.ucla.edu>
 
-	* charset.c (load_charset_map): <, not <=, for optimization.
+	* charset.c (load_charset_map): <, not <=, for optimization,
+	and to avoid potential problems with integer overflow.
 	* chartab.c (sub_char_table_set_range, char_table_set_range): Likewise.
 	* casetab.c (set_identity, shuffle): Likewise.