diff --git a/README.md b/README.md
index 8091dee..2a007d8 100644
--- a/README.md
+++ b/README.md
@@ -17,6 +17,8 @@ GoTTY is a simple command line tool that turns your CLI tools into web applicati
 
 Download the latest binary file from the [Releases](https://github.com/yudai/gotty/releases) page.
 
+(`darwin_amd64.tar.gz` is for Mac OS X users)
+
 ## Homebrew Installation
 
 You can install gotty with [Homebrew](http://brew.sh/) as well.