19 But that most precious gem with which, one hundred years ago, the sacred diadem of the Blessed Virgin was adorned, seems to Us today to shine with brighter light, since by Divine providence it fell to Our lot, toward the close of the Jubilee Year of 1950 - We recall it with gratitude - to define that the Mother of God was assumed body and soul into Heaven; and thus to satisfy the wishes of the faithful, which had been more urgently expressed after the solemn definition of the Immaculate Conception. For then, as we Ourselves wrote in the apostolic letter Munificentissimus Deus ( AAS , 42: 754) "the faithful were moved by a certain more ardent hope that the dogma also of the corporal Assumption of the Virgin Mary into Heaven should be defined as soon as possible by the supreme magisterium of the Church."
Source: Fulgens Corona (Vatican.va)