Gruntfile.js

yuidoc :
		{
			Controller :
			{
				name: '<%= pkg.name %>',
				description: '<%= pkg.description %>',
				version: '<%= pkg.version %>',
				url: '<%= pkg.homepage %>',
				options:
				{
					paths: 'app/Controller/',
					outdir: 'doc/Controller/'

				}
			}
		}
                });

		grunt.loadNpmTasks('grunt-contrib-yuidoc');

		grunt.registerTask('doc', ['yuidoc']);

Output

Running "yuidoc:Controller" (yuidoc) task             
Start YUIDoc compile...                               
Scanning: app/Controller/                             
Output: doc/Controller/                               
YUIDoc compile completed in 0.064 seconds             
                                                      
Done, without errors.                                 

UsersController.php

<?php
App::uses('AppController', 'Controller');
/**
 * Users Controller
 *
 * @property User $User
 * @property PaginatorComponent $Paginator
 */
class UsersController extends AppController {

/**
 * Components
 *
 * @var array
 */

/**
 * index method
 *
 * @return void
 */
	public function index() {
		$this->User->recursive = 0;
		$this->set('users', $this->Paginator->paginate());
	}

/**
 * view method
 *
 * @throws NotFoundException
 * @param string $id
 * @return void
 */
	public function view($id = null) {
		if (!$this->User->exists($id)) {
			throw new NotFoundException(__('Invalid user'));
		}
		$options = array('conditions' => array('User.' . $this->User->primaryKey => $id));
		$this->set('user', $this->User->find('first', $options));
	}

/**
 * add method
 *
 * @return void
 */
	public function add() {
		if ($this->request->is('post')) {
			$this->User->create();
			if ($this->User->save($this->request->data)) {
				$this->Session->setFlash(__('The user has been saved.'));
				return $this->redirect(array('action' => 'index'));
			} else {
				$this->Session->setFlash(__('The user could not be saved. Please, try again.'));
			}
		}
		$groups = $this->User->Group->find('list');
		$this->set(compact('groups'));
	}

/**
 * edit method
 *
 * @throws NotFoundException
 * @param string $id
 * @return void
 */
	public function edit($id = null) {
		if (!$this->User->exists($id)) {
			throw new NotFoundException(__('Invalid user'));
		}
		if ($this->request->is(array('post', 'put'))) {
			if ($this->User->save($this->request->data)) {
				$this->Session->setFlash(__('The user has been saved.'));
				return $this->redirect(array('action' => 'index'));
			} else {
				$this->Session->setFlash(__('The user could not be saved. Please, try again.'));
			}
		} else {
			$options = array('conditions' => array('User.' . $this->User->primaryKey => $id));
			$this->request->data = $this->User->find('first', $options);
		}
		$groups = $this->User->Group->find('list');
		$this->set(compact('groups'));
	}

/**
 * delete method
 *
 * @throws NotFoundException
 * @param string $id
 * @return void
 */
	public function delete($id = null) {
		$this->User->id = $id;
		if (!$this->User->exists()) {
			throw new NotFoundException(__('Invalid user'));
		}
		$this->request->allowMethod('post', 'delete');
		if ($this->User->delete()) {
			$this->Session->setFlash(__('The user has been deleted.'));
		} else {
			$this->Session->setFlash(__('The user could not be deleted. Please, try again.'));
		}
		return $this->redirect(array('action' => 'index'));
	}
}