diff --git a/sorter.go b/sorter.go
index 6be872a..d3d7e80 100644
--- a/sorter.go
+++ b/sorter.go
@@ -1,4 +1,4 @@
-// Copyright (c) 2013-2016 by Michael Dvorkin. All Rights Reserved.
+// Copyright (c) 2013-2019 by Michael Dvorkin and contributors. All Rights Reserved.
 // Use of this source code is governed by a MIT-style license that can
 // be found in the LICENSE file.