diff --git a/build/analysis/checkcompilerdirectives/checkcompilerdirectives.go b/build/analysis/checkcompilerdirectives/checkcompilerdirectives.go
index a3bbe85..b478fae 100644
--- a/build/analysis/checkcompilerdirectives/checkcompilerdirectives.go
+++ b/build/analysis/checkcompilerdirectives/checkcompilerdirectives.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package checkcompilerdirectives
 
 import "4d63.com/gocheckcompilerdirectives/checkcompilerdirectives"