diff --git a/ChangeLog b/ChangeLog
index 038386ccd6..1415da7709 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Mon Jul 29 16:34:29 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* hash.c (rb_hash_initialize_copy): clear old table before copy new
+	  table.
+
 Mon Jul 29 16:34:09 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* hash.c (rb_hash_assoc): aggregate object can be initialized only