diff --git a/README.md b/README.md
index 0f5a0918..16daecd0 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,8 @@ Node.js GUI Automation. Control the mouse, keyboard, and read the screen.
 
 This is a work in progress so the exported functions could change at any time before the first stable release (1.0.0). 
 
+Only tested on Mac OS X using Node.js v0.10.31. I'm working on rewriting RobotJS using [nan](https://github.com/rvagg/nan) to support other versions of Node.js. node-gyp is only configured for Mac, but this project will support Windows and Linux when I have time to test.
+
 Based on [autopy](https://github.com/msanders/autopy). 
 
 ##Installing##