def receivedSubject(room, user, subject):
    """
        The room subject has been received.

        A subject is received when you join a room and when the subject is
        changed.

        @param room: The room the subject was accepted for.
        @type room: L{muc.Room}

        @param user: The user that set the subject.
        @type  user: L{muc.User}

        @param subject: The subject of the given room.
        @type subject: C{unicode}
        """
