This paper explores the discussion about the international legal status of the “Acuerdo Final para la Terminación del Conflicto y la Construcción de una Paz Estable y Duradera” and the legal effects that such status would produce under constitutional law in Colombia. Thus, it analyses the scope of public international law sources with the aim of evaluate if the beforementioned Acuerdo complies with the requierements in order to be considered a legal source under public international law.