diff --git a/src/loader.js b/src/loader.js
index 6dff584..9fadfa6 100644
--- a/src/loader.js
+++ b/src/loader.js
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Copyright 2022 Ivan Polyakov
 const { spawn } = require('child_process');
 
 module.exports = function(content, map, meta) {