D.C. Mun. Regs. tit. 26-C, § 2514
2514.1 Any promissory note taken in connection with a retail installment contract subject to this chapter shall state on its face: 'THIS INSTRUMENT IS SUBJECT TO A RETAIL INSTALLMENT CONTRACT.'
SOURCE: Regulation No. 71-18, 17 DCR 815 (June 28, 1971); 5P DCRR § 3.109.