MS Outlook: Assign yourself a task and keep someone else updated

[StrikeEagleII]

It's pretty easy to assign someone else a task and set it so it keeps you updated as they make progress on it, but how do you do the opposite--assign yourself a task and then keep someone else updated on it? Creating a new task is easy enough and I assume you assign it to yourself by not assigning it to someone else (almost sounds philosophical...). However when I do this and then click the details tab, I can't add anyone to the 'update list'. Is the only way to keep someone else updated in this situation to have them create a new task and then assign it to me?
Thanks,
Jason