diff --git a/metropolis/cli/takeover/boot.go b/metropolis/cli/takeover/boot.go
index eb71694..21ca708 100644
--- a/metropolis/cli/takeover/boot.go
+++ b/metropolis/cli/takeover/boot.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package main
 
 import (