Cal. Rev. & Tax. Code § 43515

The board shall prepare and publish brief but comprehensive statements in simple and nontechnical language that explain procedure, remedies, and the rights and obligations of the board and taxpayers. As appropriate, statements shall be provided to taxpayers with the initial notice of audit, the notice of proposed additional taxes, any subsequent notice of tax due, or other substantive notices. Additionally, the board shall include this language for statements in the annual tax information bulletins that are mailed to taxpayers.