Updated readme to have a clearer explanation of what needs to be expo…

…sed in your virtual directory

README.md

@@ -152,7 +152,7 @@ cd jquery && grunt watch
 ```
 
 
-Run the unit tests with a local server that supports PHP. Ensure that you run the site from the root directory, not the "test" directory. No database is required. Pre-configured php local servers are available for Windows and Mac. Here are some options:
+Run the unit tests with a local server that supports PHP. Ensure that you run the site from the root directory or that you expose the test directory and any dependent sibling directories. No database is required. Pre-configured php local servers are available for Windows and Mac. Here are some options:
 
 - Windows: [WAMP download](http://www.wampserver.com/en/)
 - Mac: [MAMP download](http://www.mamp.info/en/index.html)