diff --git a/build/analysis/tools.go b/build/analysis/tools.go
index 7936b16..de52ca0 100644
--- a/build/analysis/tools.go
+++ b/build/analysis/tools.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 //go:build tools
 // +build tools