California Code
CHAPTER 1 - The Pleadings in General
Section 422.40.

422.40. In the complaint, the title of the action shall include the names of all the parties; but, except as otherwise provided by statute or rule of the Judicial Council, in other pleadings it is sufficient to state the name of the first party on each side with an appropriate indication of other parties.

(Added by Stats. 1971, Ch. 244.)