Political Constitution of Colombia (1991)

The constitutional reforms must be submitted to a referendum approved by Congress when referring to the rights recognized in Chapter I of Title II and to their guaranties, to the procedures of popular participation, or to Congress, if so requested, within the six months following the promulgation of the legislative act, by five percent of the citizens who make up the electoral rolls. The reform shall be understood to be defeated by a negative vote of the majority of the voters as long as at least one-fourth of those on the electoral rolls participate in the balloting.