The Constitutional Reform Law No. 20,050, approved on August 26, 2005, contains numerous and interesting modifications regarding international treaties. The author, prior contextualization of the state of the previous issue, examines in detail the reform itself as far as this matter is concerned.La Ley de Reforma Constitucional N° 20.050, aprobada el 26 de agosto de 2005, contiene numerosas e interesantes modificaciones en materia de tratados internacionales. La autora, previa contextualización del estado de la cuestión previa, examina en detalle la reforma misma en lo que a esta materia se refiere.