Good but need place for GF

This is a good app and I have used it several times. It is straight to the point and easy to use. But, I am very strict gluten free (Celiac Disease) and think there should be a place for the user to type in special instructions. When I go in the store to order, they always note that I have an "allergy," but it makes me nervous ordering on the app because there is no place to note that.

Krisko4385 about Five Guys Burgers & Fries