California Code, Streets and Highways Code - SHC § 8769

(a) The city will obligate itself to advance available funds from the city treasury to cure any deficiency which may occur in the bond redemption fund.If the legislative body determines to so declare under this subdivision, the legislative body may provide further security for the assessment bonds by creating an improvement district pursuant to the Benefit Assessment Act of 1982.

(b) The city will not obligate itself to advance available funds from the city treasury to cure any deficiency which may occur in the bond redemption fund. A determination not to obligate itself shall not prevent the city from, in its sole discretion, so advancing funds.

The determination made pursuant to this section shall be clearly stated in the text of the bonds issued pursuant to this division, and the title of the bonds shall include the words “Limited Obligation Improvement” in the event that the declaration in subdivision (b) is made.