diff --git a/README.md b/README.md
index 2f7cc96..2b8cefb 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,7 @@ RubyDrop is my first ever Ruby project that aims to be an open-source, roll-your
 * RubyGems
 * <a href="https://github.com/schacon/grit">Grit</a>
 * Ruby 1.9+ (need require_relative function)
+* RubyDrop is currently only available for Unix/Linux
 
 <h1>How to Run</h1>