Task not logging, laravel 5.1

In laravel 5.1 I did:

    $schedule->command('fetch_tweets')
        ->everyMinute()
        ->withoutOverlapping()
        ->appendOutputTo('../../storage/logs/tweets.log');

The task seems to have been running, this is the only one I have scheduled to run. But there is no tweets.log in the storage/logs/ folder. Ideas?

via Chebli Mohamed