Ad gentes (To the Nations) is the Second Vatican Council's decree on missionary activity that reaffirmed the need for missions and salvation in Christ. The document establishes evangelization as one of the fundamental missions of the Catholic Church and reaffirms the tie between evangelization and charity for the poor. Ad gentes also calls for the formation of strong Christian communities as well as strong relations with other Christians. Finally, it lays out guidelines for the training and actions of the missionaries.