diff --git a/LICENSE b/LICENSE
index 718061d..958d0b4 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
 The MIT License (MIT)
 
-Copyright (c) 2014, 2015 itchyny
+Copyright (c) 2013, 2014, 2015 itchyny
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal