diff --git a/internal/provider/provider_custom_diffs_test.go b/internal/provider/provider_custom_diffs_test.go
index 30dfe764b..7392b7bac 100644
--- a/internal/provider/provider_custom_diffs_test.go
+++ b/internal/provider/provider_custom_diffs_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package provider
 
 import (