California Code
ARTICLE 6 - Statements of Claim and Defense
Section 1297.233.

1297.233. Unless otherwise agreed by the parties, either party may amend or supplement his or her claim or defense during the course of the arbitral proceedings, unless the arbitral tribunal considers it inappropriate to allow the amendment or supplement having regard to the delay in making it.

(Added by Stats. 1988, Ch. 23, Sec. 1. Effective March 7, 1988.)