Prior to the revision of the Anglican Church of Canada's (ACC) Book of Common Prayer (BCP) in 1962, the national church followed the liturgical calendar of the 1918 Canadian Book of Common Prayer. Throughout most of the twentieth century, the situation in Canada resembled that which pertained in much of the Anglican Communion: There was uncertainty as to whether post-Reformation figures could or should be commemorated. In the words of the calendar's introduction, "New names have been added from the ancient calendars, and also from the history of the Anglican Communion, without thereby enrolling or commending such persons as saints of the Church." The 1962 revision added twenty-six post-Reformation individuals, as well as commemorations of the first General Synod and of "The Founders, Benefactors, and Missionaries of the Church in Canada." Of the calendar days, twenty-eight were highlighted as "red-letter days" — that is, days of required observation.