Hi Lisa! Introducing ice cubes or drinking water on your oven can really assist with crust growth (specially when baking sourdoughs!). Although It is far from Totally necessary, it can help make a gorgeous loaf. Here's a tad more information on the process: Baking bread with steam Joyful Baking! Proof https://byd-atto-369415.alltdesign.com/the-best-side-of-sourdough-pizza-crust-48097749