diff --git a/ChangeLog b/ChangeLog
index 6f93547ceb..5ed558b7be 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -5,8 +5,8 @@ Tue Dec  3 20:18:46 2013  Narihiro Nakamura  <authornari@gmail.com>
 
 Tue Dec  3 20:16:38 2013  Masaki Matsushita  <glass.saga@gmail.com>
 
-	* array.c (rb_hash_rehash): use hash_alloc() instead of rb_hash_new().
-	  [Bug #9187]
+	* array.c (rb_hash_rehash): use hash_alloc() instead of rb_hash_new(),
+	  to hide temprary object from ObjectSpace.  [Bug #9187]
 
 Tue Dec  3 17:11:47 2013  Aman Gupta <ruby@tmm1.net>