Zend Framework中控制器中的额外文件夹

I would like to add a new directory in controllers. I don't want to create a module or something. My structure is like this:

application
    controllers
        connections
    models
    ...

I would like to be able to add any controller to connections so that I can use it.

Oh and, the controllers inside connections will only be used by

// forward to an action in another controller:
// FooController::bazAction(),
// in the current module:
$this->_forward('baz', 'foo', null, array('baz' => 'bogus'));

My question is what do I have to add to bootstrap (or anywhere else) to be able to use those controllers?

I keep getting the error message: Invalid Controller

Considering the following structure:

application
    controllers
        Connection  (with a capitalized C and no S)
    models
    ...

You may forward to the controller using:

// forward to an action in another controller:
// Connection_FooController::bazAction(),
// in the current module:
$this->_forward('baz', 'connection_foo', null, array('baz' => 'bogus'));