Rules on Civil Procedure
Section 6. Supplemental pleadings. - Upon motion of a party the court may, upon reasonable notice and upon such terms as are just, permit him to serve a supplemental pleading setting forth transactions, occurrences or events which have happened since the date of the pleading sought to be supplemented. The adverse party may plead thereto within ten (10) days from notice of the order admitting the supplemental pleading. (6a)