diff --git a/osbase/sysctl/options.go b/osbase/sysctl/options.go
index b5e1e36..583a1dc 100644
--- a/osbase/sysctl/options.go
+++ b/osbase/sysctl/options.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package sysctl
 
 import (