Most task managers that allow comments on a task allow for more than one comment. This is useful for managing a task where multiple people are working, updating a task with new information, and marking down when something has been accomplished on a task. At the very least, we should have the ability to edit existing comments and add new information, correct spelling errors, etc. As it stands, you can add one comment, never edit or change it, and only one person can comment. Comments would be much more useful if you could add more than one.