diff --git a/ChangeLog b/ChangeLog
index b385ff9206..e010af8cd4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -14,15 +14,15 @@ Wed Jul  4 19:13:15 2012  Masaki Suketa <masaki.suketa@nifty.ne.jp>
 	  FileSystemObject only supports ANSI or UTF-16LE encoding.
 	  Patch by h.shirosaki (Hiroshi Shirosaki) [ruby-trunk - Bug #6650]
 
-
 Wed Jul  4 11:52:12 2012  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* gc.c (ATOMIC_SIZE_*): 64bit Windows support.
 
 Wed Jul  4 11:11:28 2012  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
-	* eval.c (rb_frame_callee, rb_f_callee_name): fix to return the called
-	  id.
+	* eval.c (rb_frame_callee, rb_f_callee_name): fix to return the
+	  called id.  this longstanding bug has been caused and blocked by
+	  the structure of old rb_control_frame_t and rb_iseq_t.
 
 	* vm_insnhelper.c (vm_push_frame): set proper method entry.