diff --git a/cloud/apigw/main.go b/cloud/apigw/main.go
index 9c0ebff..4d2ca31 100644
--- a/cloud/apigw/main.go
+++ b/cloud/apigw/main.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package main
 
 import (