gistfile1.diff

diff --git a/README.textile b/README.textile
index 6ee8d12..57d3c85 100644
--- a/README.textile
+++ b/README.textile
@@ -38,6 +38,9 @@ h4. Testing
  
 * "*shoulda*":http://github.com/thoughtbot/shoulda - Testing framework
 * "*rspec*":http://wiki.github.com/dchelimsky/rspec - Testing framework
+* "*mocha*":http://github.com/floehopper/mocha - Mocking and stubbing library
+
+If you are getting <pre>NoMethodError: undefined method 'any_instance'</pre> errors when running your test suite, you may need to install mocha.
 
 h2. Features