CA Gov't Code Section 84508

If disclosure of two major donors is required by Sections 84503 and 84506, the committee shall be required to disclose, in addition to the committee name, only its highest major contributor in any advertisement which is:

(a)

An electronic broadcast of 15 seconds or less, or

(b)

A newspaper, magazine, or other public print media advertisement which is 20 square inches or less.