Prescreening questions: Should a text box open to allow additional comments?

Summary:

I am creating a few new prescreening questions that will be a single choice answer. I've selected to "Add Additional Comments" but after I save as Active, and add to a requisition, when applying, I don't see a comment box. How are they supposed to add additional comments?

I'm setting this up 2 ways in one of our test pods as our TA team want to see examples of both ways:

1. One prescreen question with a short list of values - but will request the applicant to be more specific (example, if they choose campus event, in the comment box ideally they would include which university and event at that university).