diff --git a/README.md b/README.md
index a56bdf6..369a0e7 100644
--- a/README.md
+++ b/README.md
@@ -61,6 +61,30 @@ Submitting a Pull Request
 6. Commit and push your changes.
 7. Submit a pull request. Please do not include changes to the gemspec or version file. (If you want to create your own version for some reason, please do so in a separate commit.)
 
+Supported Rubies
+----------------
+This library aims to support and is [tested
+against](http://travis-ci.org/codeforamerica/adopt-a-hydrant) the following
+Ruby implementations:
+
+* Ruby 1.8.7
+* Ruby 1.9.2
+* Ruby Enterprise Edition 1.8.7
+
+If something doesn't work on one of these interpreters, it should be considered
+a bug.
+
+This library may inadvertently work (or seem to work) on other Ruby
+implementations, however support will only be provided for the versions listed
+above.
+
+If you would like this library to support another Ruby version, you may
+volunteer to be a maintainer. Being a maintainer entails making sure all tests
+run and pass on that implementation. When something breaks on your
+implementation, you will be personally responsible for providing patches in a
+timely fashion. If critical issues for a particular implementation exist at the
+time of a major release, support for that Ruby version may be dropped.
+
 Copyright
 ---------
 Copyright (c) 2011 Code for America.