The Board is publishing revisions to the official staff commentary to Regulation Z (Truth in Lending). The commentary applies and interprets the requirements of Regulation Z. The revisions provide guidance mainly on issues relating to reverse mortgages and mortgages bearing rates above a certain percentage or fees above a certain amount. The update also addresses issues of general interest, such as a card issuer's responsibilities when a cardholder asserts a claim or defense relating to a merchant dispute.