diff --git a/util/pidowner/pidowner_test.go b/util/pidowner/pidowner_test.go
index 53eb3a5f7..ac81293d5 100644
--- a/util/pidowner/pidowner_test.go
+++ b/util/pidowner/pidowner_test.go
@@ -1,3 +1,7 @@
+// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
 package pidowner
 
 import (