protected function _render($params) {
		foreach ($params as $name => $param) {
			if ($name === 'run' || empty($param['name'])) {
				continue;
			}
			$usage = (!empty($param['usage'])) ? trim($param['usage'], ' []') : $param['name'];
			$this->out($this->_pad($usage), 'option');

			if ($param['description']) {
				$this->out($this->_pad($param['description'], 2));
			}
			$this->nl();
		}
	}