diff --git a/spec/rackstash/adapters/file_spec.rb b/spec/rackstash/adapters/file_spec.rb
index 7b4c268..feffdc5 100644
--- a/spec/rackstash/adapters/file_spec.rb
+++ b/spec/rackstash/adapters/file_spec.rb
@@ -1,3 +1,8 @@
+# Copyright 2017 Holger Just
+#
+# This software may be modified and distributed under the terms
+# of the MIT license. See the LICENSE.txt file for details.
+
 require 'spec_helper'
 require 'tempfile'
 require 'tmpdir'