Cal. Civ. Code § 3273.24

(a) A mortgage servicer shall disclose to a borrower to whom a forbearance has been granted pursuant to Section 3273.23 that the forborne mortgage payments are required to be repaid.
(b) The disclosure required by subdivision (a) is only required to be furnished to the borrower once at the beginning of the forbearance period.
(c) A lump sum payment shall not be required for a borrower who was current on the residential mortgage loan when the borrower entered forbearance.