diff --git a/osbase/supervisor/supervisor_metrics.go b/osbase/supervisor/supervisor_metrics.go
index d83b7a7..30dac3b 100644
--- a/osbase/supervisor/supervisor_metrics.go
+++ b/osbase/supervisor/supervisor_metrics.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package supervisor
 
 import (