California Code, Code of Civil Procedure - CCP § 471.5

(a) If the complaint is amended, a copy of the amendments shall be filed, or the court may, in its discretion, require the complaint as amended to be filed, and a copy of the amendments or amended complaint must be served upon the defendants affected thereby. The defendant shall answer the amendments, or the complaint as amended, within 30 days after service thereof, or such other time as the court may direct, and judgment by default may be entered upon failure to answer, as in other cases. For the purposes of this subdivision, “complaint” includes a cross-complaint, and “defendant” includes a person against whom a cross-complaint is filed.

(b) If the answer is amended, the adverse party has 10 days after service thereof, or such other time as the court may direct, in which to demur to the amended answer.