Maryland Code, Labor and Employment § 3-1102

(1) is served on the employer within the statute of limitations period under § 5-101 of the Courts Article;

(2) is personally served in accordance with Maryland Rule 2-121; and

(3) contains the information required by the Commissioner under § 3-1110 of this subtitle to provide the employer with adequate notice of the wages claimed and the property against which the lien for unpaid wages is sought.