diff --git a/pkg/api/blocks/v1_test.go b/pkg/api/blocks/v1_test.go
index 9f09099217..53a9c0d2a0 100644
--- a/pkg/api/blocks/v1_test.go
+++ b/pkg/api/blocks/v1_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) The Thanos Authors.
+// Licensed under the Apache License 2.0.
+
 package v1
 
 import (