Quick search by citation:

15 U.S. Code § 1663 - Advertising of open end credit plans

No advertisement to aid, promote, or assist directly or indirectly the extension of consumer credit under an open end credit plan may set forth any of the specific terms of that plan unless it also clearly and conspicuously sets forth all of the following items:
Any minimum or fixed amount which could be imposed.
In any case in which periodic rates may be used to compute the finance charge, the periodic rates expressed as annual percentage rates.
Any other term that the Bureau may by regulation require to be disclosed.
Editorial Notes

2010—Par. (3). Pub. L. 111–203 substituted “Bureau” for “Board”.

1980—Pub. L. 96–221 in existing introductory text struck out applicability of rate determined under section 1637(a)(5) of this title, and amended section generally substituting items setting forth minimum or fixed amount, etc., set out in pars. (1) to (3), for items time period, etc., set out in pars. (1) to (5).

Statutory Notes and Related Subsidiaries
Effective Date of 2010 Amendment

Amendment by Pub. L. 111–203 effective on the designated transfer date, see section 1100H of Pub. L. 111–203, set out as a note under section 552a of Title 5, Government Organization and Employees.

Effective Date of 1980 Amendment

Amendment by Pub. L. 96–221 effective on expiration of two years and six months after Mar. 31, 1980, with all regulations, forms, and clauses required to be prescribed to be promulgated at least one year prior to such effective date, and allowing any creditor to comply with any amendments, in accordance with the regulations, forms, and clauses prescribed by the Board prior to such effective date, see section 625 of Pub. L. 96–221, set out as a note under section 1602 of this title.