diff --git a/metropolis/cli/metroctl/cmd_cluster_takeownership.go b/metropolis/cli/metroctl/cmd_cluster_takeownership.go
index 068dd3b..3566ea0 100644
--- a/metropolis/cli/metroctl/cmd_cluster_takeownership.go
+++ b/metropolis/cli/metroctl/cmd_cluster_takeownership.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package main
 
 import (