Maryland Code, State Government § 18-208

(a) If an individual is physically unable to sign a record, the individual may appear before the notarial officer and direct another individual other than the notarial officer who is concurrently appearing with the individual before the notarial officer to sign the individual's name on the record.

(b) If another individual is directed to sign an individual's name under subsection (a) of this section, the notarial officer shall insert on the record the following words or words of similar import: “Signature affixed by (name of other individual) at the direction of (name of individual)”.