Section 21.16 - Required document headings(a) Each rule and proposed rule document submitted to the Office of the Federal Register shall contain the following headings, when appropriate, on separate lines in the following order:(3) Numerical references to the CFR title and parts affected;(4) Agency numbers of identifying symbol in brackets, if used;(5) Brief subject heading describing the document.(b) Each CFR section in the regulatory text of the document shall have a brief descriptive heading, preceding the text, on a separate line.50 FR 12468, Mar. 28, 1985