diff --git a/osbase/net/dns/dns_test.go b/osbase/net/dns/dns_test.go
index 7dd670c..5b61b36 100644
--- a/osbase/net/dns/dns_test.go
+++ b/osbase/net/dns/dns_test.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package dns
 
 import (