Fed. R. Crim. P. 7 - The Indictment and the Information

(1) Felony. An offense (other than criminal contempt) must be prosecuted by an indictment if it is punishable:

(2) Misdemeanor. An offense punishable by imprisonment for one year or less may be prosecuted in accordance with Rule 58(b)(1).

(1) In General. The indictment or information must be a plain, concise, and definite written statement of the essential facts constituting the offense charged and must be signed by an attorney for the government. It need not contain a formal introduction or conclusion. A count may incorporate by reference an allegation made in another count. A count may allege that the means by which the defendant committed the offense are unknown or that the defendant committed it by one or more specified means. For each count, the indictment or information must give the official or customary citation of the statute, rule, regulation, or other provision of law that the defendant is alleged to have violated. For purposes of an indictment referred to in section 3282 of title 18, United States Code, for which the identity of the defendant is unknown, it shall be sufficient for the indictment to describe the defendant as an individual whose name is unknown, but who has a particular DNA profile, as that term is defined in section 3282.

(2) Citation Error. Unless the defendant was misled and thereby prejudiced, neither an error in a citation nor a citation’s omission is a ground to dismiss the indictment or information or to reverse a conviction.