Note about ruby 1.9.

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bernd · Jan 12, 2013 · 7e551d5 · 7e551d5
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@@ -7,8 +7,11 @@ AS::Notification is an extraction of ActiveSupport::Notifications from
 **It will track activesupport 4.x once that's released.**
 
 [![Build Status](https://travis-ci.org/bernd/as-notifications.png?branch=master)](https://travis-ci.org/bernd/as-notifications)
+
 [API documentation](http://rubydoc.info/github/bernd/as-notifications/master/AS/Notifications)
 
+**Only works on Ruby 1.9 implementations!**
+
 ## Installation
 
     $ gem install as-notifications