diff --git a/test/dropbox/user_v2.yaml b/test/dropbox/user_v2.yaml
index a17db7e..ca9edd7 100644
--- a/test/dropbox/user_v2.yaml
+++ b/test/dropbox/user_v2.yaml
@@ -1,3 +1,8 @@
+# Copyright 2018 - Stomakun <https://github.com/stomakun>
+# SPDX-License-Identifier: UNLICENSED
+
+# This file is taken from https://github.com/stomakun/DropboxSwagger
+
 openapi: 3.0.1
 info:
   title: Dropbox User API v2