Hello Lisa! Including ice cubes or water towards your oven can really assist with crust development (specially when baking sourdoughs!). Even though It's not absolutely important, it will help create a wonderful loaf. Here's a bit more info on the process: Baking bread with steam Pleased Baking! You can see https://tysonolgav.getblogs.net/60679889/detailed-notes-on-sourdough-traduction