Rule 2232(a)*(1) - Defective Joinder, Change of Parties, Notice(1)Notice of Pendency of Action. Notice required by this rule shall contain a statement of the pendency of the action, shall state the Prothonotary's number of the action, the parties thereto and its nature and that the person to whom it is addressed is required to join therein within twenty (20) days after receipt of such notice or his cause of action will be barred and the action will proceed without said person. Proof of service shall be by affidavit accompanied with a copy of the notice and the return receipt, filed with the Prothonotary.Montgo. Cnty. Pa. 2232(a)*(1)