I am trying to make up an invoice to send to a client. I've never really done this officially before but a client would like one. I am trying to decide what should be included... I guess billing period. Services are website updates and maintenance...Since I charge for updates by the hour, do you think I need to write how many hours I'm charging for or it's enough that I told them at the beginning of the project how much the updates will be per hour and now I can just put a total...? I wish I could see a sample of an experienced web designer's invoice to get a better idea of what it should look like... thanks for any tips in advance!