diff --git a/ChangeLog b/ChangeLog
index 19716cc9db..5f797204b0 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Mon Jan  4 15:36:38 2016  Sho Hashimoto  <sho-h@ruby-lang.org>
+
+	* thread_sync.c: [DOC] remove SizedQueue#close argument.
+	  [ci skip]
+
 Mon Jan  4 12:07:00 2016  Naohisa Goto  <ngotogenome@gmail.com>
 
 	* version.h (RUBY_BUILD_VERSION_STR_3): Workaround for old version of
diff --git a/thread_sync.c b/thread_sync.c
index e270b12538..9ac28a9aa0 100644
--- a/thread_sync.c
+++ b/thread_sync.c
@@ -917,7 +917,7 @@ rb_szqueue_initialize(VALUE self, VALUE vmax)
 /*
  * Document-method: SizedQueue#close
  * call-seq:
- *   close(exception=false)
+ *   close
  *
  * Similar to Queue#close.
  *