Del. Code tit. 5 § 947
If credit under a revolving credit plan is offered and extended in connection with a demand deposit account or other transaction account maintained by the borrower with the bank pursuant to an agreement or arrangement whereby the bank agrees to honor checks, drafts or other debits to such account, which if paid would create or increase a negative balance in such account, by making extensions of credit to such borrower under such revolving credit plan, any charges customarily imposed by the bank under the terms governing such demand deposit or other transaction account in the absence of any associated revolving credit plan (including, without limitation, check charges, monthly maintenance charges, checkbook charges, charges for checks drawn on funds in excess of an available line of credit and other similar charges) may continue to be imposed on such account without specific reference thereto or incorporation thereof by reference in the agreement governing the revolving credit plan and the amount of any such charge, to the extent the balance in such demand deposit or other transaction account is insufficient to pay such a charge, may be charged to the borrower's account under the plan as a loan thereunder and may be included in outstanding unpaid indebtedness in accordance with the terms of the agreement governing such revolving credit plan.
5 Del. C. § 947