Note regarding usage of flight in a subdirectory

Thanks to this question and answer http://stackoverflow.com/questions/20890210/flight-php-routing-from-subdirectory

README.md

@@ -47,6 +47,8 @@ RewriteCond %{REQUEST_FILENAME} !-d
 RewriteRule ^(.*)$ index.php [QSA,L]
 ```
 
+**Note**: If you need to use flight in a subdirectory add the line `RewriteBase /flight/` just after `RewriteEngine On`.
+
 For *Nginx*, add the following to your server declaration:
 
 ```