diff --git a/pwa/service-worker.js b/pwa/service-worker.js
index 2ce1c1d8..d34e1859 100644
--- a/pwa/service-worker.js
+++ b/pwa/service-worker.js
@@ -1,3 +1,5 @@
+// @license magnet:?xt=urn:btih:1f739d935676111cfff4b4693e3816e664797050&dn=gpl-3.0.txt GPL-3.0-or-later  
+
 'use strict';
 
 var cacheVersion = 1;
@@ -31,4 +33,6 @@ this.addEventListener('fetch', event => {
       })
     );
   }
-});
\ No newline at end of file
+});
+
+// @license-end
\ No newline at end of file