diff --git a/ChangeLog b/ChangeLog
index 806e7a4c61..c09b1bd868 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Mon Dec 30 23:33:07 2013  Ayumu AIZAWA  <ayumu.aizawa@gmail.com>
+
+	* variable.c: adding extra example in docs.
+	  patched by Steve Klabnik. [Bug #9210]
+
 Mon Dec 30 18:34:18 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* encoding.c (must_encindex, rb_enc_from_index, rb_obj_encoding): mask
diff --git a/variable.c b/variable.c
index 350bb582db..424730dcb9 100644
--- a/variable.c
+++ b/variable.c
@@ -2517,8 +2517,9 @@ cvar_list(void *data)
  *     class Two < One
  *       @@var2 = 2
  *     end
- *     One.class_variables   #=> [:@@var1]
- *     Two.class_variables   #=> [:@@var2, :@@var1]
+ *     One.class_variables          #=> [:@@var1]
+ *     Two.class_variables          #=> [:@@var2, :@@var1]
+ *     Two.class_variables(false)   #=> [:@@var2]
  */
 
 VALUE