How to contact schools about new information that could strengthen my application

[wannabecomputerscientist]

I received word today that a paper that I am first author on has been accepted for presentation at a conference with  publication in the conference's associated journal. Now this would obviously strengthen my application (Computer Science PhD). Yet how would I inform the schools that I have applied to about this change. Should I call up the department, send an email, provide the notification of acceptance (email), write a formal statement? Any advice is highly appreciated.

[Usmivka]

I assume you've already taken care of this, but send an email with an updated CV.