diff --git a/README.md b/README.md
index f2ce71b5d1..7610b61981 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,5 @@
 # acorn-6to5
 
 [![Build Status](https://travis-ci.org/sebmck/acorn-6to5.svg?branch=master)](https://travis-ci.org/sebmck/acorn-6to5)
+
+Based on [acorn-jsx](https://github.com/RReverser/acorn-jsx).