diff --git a/README.md b/README.md
index b0bdae26..c782313a 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ Mutant is a mutation testing tool for ruby. It aims to be better than existing m
 The idea is that if code can be changed and your tests do not notice, either that code isn't being covered
 or it does not have a speced side effect.
 
-Mutant supports MRI and RBX gte 19-mode, while support for jruby is planned. It should also work under any ruby
+Mutant supports MRI and RBX gte 19-mode (1.9.3!), while support for jruby is planned. It should also work under any ruby
 engine that supports POSIX-fork(2) semantics.
 
 Only rspec2 is supported currently. This is subject to change.