When defining cronjob, please mention following details:

• Responsibility
• When it will be executed

Please apply either @cronjob or @api phpdoc tag (especially if the cronjob is trigger-able via HTTP).

Here’s a sample for that:

class Cronjob
{
    /**
     * Periodic (self defined) cronjob.
     *
     * Currently runs on 5:55 (6am), 8:55 (9am), 11:55 (12pm), 16:55 (5pm) 
     * everyday.
     *
     * Responsible for sending reminder of un-followed-up tesride requests to 
     * dealers everyweekday.
     *
     * @api
     *
     * @return void
     */
    public function periodic_dealer_testride_reminder()
    {
    }
}

An additional notes: There are proposed new PHP Standard for PHP Docs tags: PSR5.