diff --git a/types/key/disco_test.go b/types/key/disco_test.go
index f328b6b92..5c2f80818 100644
--- a/types/key/disco_test.go
+++ b/types/key/disco_test.go
@@ -1,3 +1,7 @@
+// Copyright (c) 2021 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 key
 
 import (