Googlesites and Docs

I just spent the last three hours finishing my googlesite. I am very pleased. I know that it was not necessarily a class assignment, but I wanted to finish the site before the class ended. I do have one question, though. When I went on my husband's computer to view my site, the google doc under my question and answers page was asking for him to sign in to his gmail. Do you have to sign in to a gmail account in order to write on a google doc? I have the document set to public, too.