Routing - subfolder [solved]

[eluser]überfuzz[/eluser]
I have a admin area on a site. The admin controllers are placed in a subfolder like this:

Code:

controllers/admin/home.php
                  anothercontroller.php
                  yetanothercontroller.php

How do I reach the controllers in the admin folder? I tried to write some custom routes in the config/routes.php. No luck! Some pointers would be appreciated... Or am I barking up the wrong tree, should I work this differently..?