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diff --git a/README.md b/README.md
index 73f3928..7663af9 100644
--- a/README.md
+++ b/README.md
@@ -131,6 +131,8 @@ Up to date with readability.js as of [16 Oct 2017](https://github.com/mozilla/re
  
 ## License
 
+Based on Arc90's readability.js (1.7.1) script available at: http://code.google.com/p/arc90labs-readability
+
     Copyright (c) 2010 Arc90 Inc
 
     Licensed under the Apache License, Version 2.0 (the "License");