diff --git a/lib/integer/base.rb b/lib/integer/base.rb
index e1b7cc0..082ebbb 100644
--- a/lib/integer/base.rb
+++ b/lib/integer/base.rb
@@ -1,11 +1,15 @@
 # Copyright (C) 2011  Kenichi Kamiya
 
 class Integer
-  module Base 
+
+  module Base
+
     class InvalidCharacter < TypeError; end
 
     SPECIAL_CHAR = /[\x00-\x20\-\+]/
+
   end
+
 end
 
 require_relative 'base/version'