diff --git a/lib/discover/cache.go b/lib/discover/cache.go
index ade5f2d9d..2fb99f9f1 100644
--- a/lib/discover/cache.go
+++ b/lib/discover/cache.go
@@ -1,3 +1,9 @@
+// Copyright (C) 2015 The Syncthing Authors.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
 package discover
 
 import (