diff --git a/src/bundle/rewriters/css.ts b/src/bundle/rewriters/css.ts
index 381394b..17b9ecf 100644
--- a/src/bundle/rewriters/css.ts
+++ b/src/bundle/rewriters/css.ts
@@ -1,3 +1,6 @@
+// This CSS rewriter uses code from Meteor
+// You can find the original source code at https://github.com/MeteorProxy/Meteor
+
 import { encodeUrl } from "./url";
 
 export function rewriteCss(css: string, origin?: URL) {