This restaurant advertises gluten free pizzas safe for celiacs (they use the German word) - Zöliakie). They have it on a sign in the window, and on a chalk sandwich board on the sidewalk outside.
I do not understand why they did this, as the menu inside warns that the same oven is used for the wheat-containing pizzas, and that cross-contamination is possible.
— Somewhat
— Gluten-free items are marked on the main menu
— Some
— Average