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 (
diff --git a/cloud/apigw/model/migrations.go b/cloud/apigw/model/migrations.go
index 2c07768..95b5dcf 100644
--- a/cloud/apigw/model/migrations.go
+++ b/cloud/apigw/model/migrations.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package model
 
 import (
diff --git a/cloud/apigw/server/server.go b/cloud/apigw/server/server.go
index 902b4e0..d075e98 100644
--- a/cloud/apigw/server/server.go
+++ b/cloud/apigw/server/server.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package server
 
 import (
diff --git a/cloud/apigw/server/server_test.go b/cloud/apigw/server/server_test.go
index 704de36..1455f63 100644
--- a/cloud/apigw/server/server_test.go
+++ b/cloud/apigw/server/server_test.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package server
 
 import (