diff --git a/ChangeLog b/ChangeLog
index 4d5f217d62..0f07e316f1 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Wed Jan 27 16:34:35 2016  boshan  <boshan@subsplash.com>
+
+	* lib/tempfile.rb (Tempfile#initialize): [DOC] the first parameter
+	  `basename` is optional and defaulted to an empty string since
+	  [GH-523].  [Fix GH-1225]
+
 Wed Jan 27 16:25:54 2016  Koichi ITO  <koic.ito@gmail.com>
 
 	* array.c (rb_ary_dig): [DOC] fix the exception class to be raised
diff --git a/lib/tempfile.rb b/lib/tempfile.rb
index 13d9585a3b..223637f84a 100644
--- a/lib/tempfile.rb
+++ b/lib/tempfile.rb
@@ -80,7 +80,7 @@ require 'tmpdir'
 # mutex.
 class Tempfile < DelegateClass(File)
   # call-seq:
-  #    new(basename, [tmpdir = Dir.tmpdir], [options])
+  #    new(basename = "", [tmpdir = Dir.tmpdir], [options])
   #
   # Creates a temporary file with permissions 0600 (= only readable and
   # writable by the owner) and opens it with mode "w+".