Md. Code, Courts and Judicial Proceedings § 3–1405

A release by the injured person of one joint tort-feasor does not relieve the joint tort-feasor from liability to make contribution to another joint tort-feasor unless the release:

(1) Is given before the right of the other tort-feasor to secure a money judgment for contribution has accrued; and

(2) Provides for a reduction, to the extent of the pro rata share of the released tort-feasor, of the injured person’s damages recoverable against all other tort-feasors.