Contact form 7 required filed

Hi, I was wondering if anyone can help me make a filed on my contact from required, I am trying to make the "phone number field required, here is my form code. Thank yuo in advance


<div class="col-sm-4 noleftpadding"><p>[text text-931 placeholder "Phone Number"]</p></div>

 

This might help, says you need a * in a class to make it required:

https://contactform7.com/text-fields/