Great job on adding a class description! Rather than adding a line like "Created a Book class" - since that will be the same for every class and doesn't convey much information - try to give a brief description of the class and its purpose. Things like default values when the class is initialized are best left for the argument comments on the `initialize` method. Check out [TomDoc] for good examples of class documentation, and ping me if you ever need any help with doc formatting.