In addition to the language required by s. 422.305(1), Stats., a merchant may include within the explanation of personal obligation a form number, the date of execution, instructions for completion, and a union printing label. Paragraph (a) of the explanation may provide that the obligation of the person signing it includes all extensions, renewals or deferrals of the particular transaction in which there is no advance of or increase in the amount of the principal or increase in the rate of finance charge.
Wis. Admin. Code Department of Financial Institutions DFI-WCA 1.341