The General Instruction of the Roman Missal also replaced the document that in the original Tridentine Roman Missal (1570) was called "Ritus servandus in celebratione Missarum" (Rite to be observed in celebration of Masses) and that, after being revised by Pope Clement VIII, appeared in editions from 1604 on in altered and amplified form under the title "Ritus servandus in celebratione Missae" (Rite to be observed in celebration of Mass). In his 1962 edition, Pope John XXIII had made some changes in this document.