Cal. Probate Code § 21540

If an instrument indicates the transferor’s intention to comply with the Internal Revenue Code requirements for a charitable remainder unitrust or a charitable remainder annuity trust as each is defined in Section 664 of the Internal Revenue Code, the provisions of the instrument, including any power, duty, or discretionary authority given to a fiduciary, shall be construed to comply with the charitable deduction provisions of Section 2055 or Section 2522 of the Internal Revenue Code and the charitable remainder trust provisions of Section 664 of the Internal Revenue Code in order to conform to that intent. In no event shall the fiduciary take an action or have a power that impairs the charitable deduction. The provisions of the instrument may be augmented in any manner consistent with Section 2055(e) or Section 2522(c) of the Internal Revenue Code on a petition provided for in Section 17200.