Select Null option on helper on CakePHP3

Hi,
Would you please let me know how I can add a Null option to Cake php3 form helper.

In my drop down I am listing all the company names from database, but I don't know how I can add a null option to this. Because of this, I am compelled to select any company and it is not letting me to choose no company.

The Code I use is as following.

Controller
======
$this->set('company_list',$company_list);

View
=========
 echo $this->Form->select('company_id',['Company' => $company_list]);

Thanks,
Jipson

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