README.md in silencer-0.6.0 vs README.md in silencer-1.0.0.rc1

@@ -3,9 +3,11 @@
 [travis]: http://travis-ci.org/spagalloco/silencer
 [gemnasium]: https://gemnasium.com/spagalloco/silencer
 
 Silencer is a simple rack-middleware for Rails that can selectively disable logging on per-action basis.  It's based on a [blog post](http://dennisreimann.de/blog/silencing-the-rails-log-on-a-per-action-basis/) by Dennis Reimann.
 
+__Note__: Silencer is not thread safe.
+
 ## Installation
 
 Just add silencer to your Gemfile:
 
     gem 'silencer'