Updated example_box\readme

example_box/README.md

@@ -2,8 +2,14 @@
 
 This directory contains the sample contents of a box for `azure` provider. Build this into a box using:
 
+On Windows:
 ```
 C:\> bsdtar -cvzf azure.box metadata.json Vagrantfile
 ```
 
+On *Nix:
+```
+$ tar cvzf azure.box ./metadata.json ./Vagrantfile
+```
+
 You can add any defaults supported by the ```azure``` provider to the `Vagrantfile` in your box and Vagrant's built-in merging system will set them as defaults. Users can override these defaults in their own Vagrantfiles.