diff --git a/README.md b/README.md
index 706f8d5..d52d460 100644
--- a/README.md
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@@ -20,8 +20,12 @@ Validate and Save
When you save a Ruby file, it will first validate the syntax and print any validation error as a tooltip.
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You can get more detailed syntax error information if you have Rubinius installed (and `rbx` in TextMate's $PATH).
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If you have Homebrew installed:
brew install rubinius