README.md in balanced-1.0 vs README.md in balanced-1.0.1

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 Online Marketplace Payments
 
 [![Build Status](https://secure.travis-ci.org/balanced/balanced-ruby.png)](http://travis-ci.org/balanced/balanced-ruby)
 [![Code Climate](https://codeclimate.com/badge.png)](https://codeclimate.com/github/balanced/balanced-ruby)
 
+**v1.x requires Balanced API 1.1. Use [v0.x](https://github.com/balanced/balanced-ruby/tree/rev0) for Balanced API 1.0.**
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 ## Installation
 
 Add this line to your application's Gemfile:
 
     gem 'balanced'