diff --git a/polyfills/vendor/README.md b/polyfills/vendor/README.md
index 7a13cbe6..6ac810ef 100644
--- a/polyfills/vendor/README.md
+++ b/polyfills/vendor/README.md
@@ -1 +1,2 @@
-[CustomElements.js](https://github.com/webcomponents/webcomponentsjs/releases)
+* [CustomElements.js](https://github.com/webcomponents/webcomponentsjs/releases)
+* [promise.js](https://github.com/taylorhakes/promise-polyfill)