Rails - May 2005 - Routing for A::B::C type controllers

Hi all,

I have a problem getting the following URL to work. If the nesting is
one less level, then everything works correctly and
Admin::ProjectController is called. How can I make this route go to

controller => Admin::Project::DescriptionController
action => add
id => 0

The error I get is,

No route for path: "admin/project/description/add/0"

Failure reasons:

<ActionController::Routing::Route ":controller/:action/:id" ||
{:id=>nil, :action=>"index"}> failed because unused
components were left: 0


Thanks in advance,
Adam