I have found it,Praetorian. It is in the Book called "A Pathway under the Gaze of Mary" (English Edition, p.69.) (2nd Edition, June, 2015). "Then our Lady requested: When you pray the Rosary, say after each mystery: O my Jesus, forgive us, save us from the fire of hell. Lead all souls to heaven, especially those who are most in need." I will keep looking for the actual information about who decided to add to it. From memory, it was at the time when the Ecclesiastical authorities were looking at approving it for public use.