diff --git a/README.md b/README.md
index 4d17a752a..c3a6c9483 100644
--- a/README.md
+++ b/README.md
@@ -1,40 +1,44 @@
 Puppet
 ======
 
 Puppet, an automated administrative engine for your Linux and Unix systems, performs
 administrative tasks (such as adding users, installing packages, and updating server
 configurations) based on a centralized specification.
 
-Documentation (and detailed installation instructions) can be found online at the 
+Documentation (and detailed installation instructions) can be found online at the
 [Puppet Docs site](http://docs.puppetlabs.com).
 
 Installation
 ------------
 
 Generally, you need the following things installed:
 
-* Ruby >= 1.8.1 (earlier releases might work but probably not)
+* A supported Ruby version. Ruby 1.8.5, 1.8.7, and 1.9.2 are fully supported
+  (with a handful of known issues under 1.9.2); Ruby 1.8.1 is supported on a
+  best-effort basis for agent use only. Other versions of Ruby are used at your
+  own risk, and Ruby 1.8.6, 1.9.0, and 1.9.1 are not recommended for
+  compatibility reasons.
 
 * The Ruby OpenSSL library.  For some reason, this often isn't included
   in the main ruby distributions.  You can test for it by running
   'ruby -ropenssl -e "puts :yep"'.  If that errors out, you're missing the
   library.
 
   If your distribution doesn't come with the necessary library (e.g., on Debian
   and Ubuntu you need to install libopenssl-ruby), then you'll probably have to
   compile Ruby yourself, since it's part of the standard library and not
   available separately.  You could probably just compile and install that one
   library, though.
 
 * Facter => 1.5.1 (available via your package manager or from the [Facter site](http://puppetlabs.com/projects/facter).
 
 License
 -------
 
 See LICENSE file.
 
 Support
 -------
 
 Please log tickets and issues at our [Projects site](http://projects.puppetlabs.com)