California Code, Business and Professions Code - BPC § 17507

It is unlawful for any person, firm, corporation or association to make an advertising claim or representation pertaining to more than one article of merchandise or type of service, within the same class of merchandise or service, if any price set forth in such claim or representation does not clearly and conspicuously identify the article of merchandise or type of service to which it relates.  Disclosure of the relationship between the price and particular article of merchandise or type of service by means of an asterisk or other symbol, and corresponding footnote, does not meet the requirement of clear and conspicuous identification when the particular article of merchandise or type of service is not represented pictorially.