Règle correspondante
Mexico
Practice Relating to Rule 100. Fair Trial Guarantees
Section D. Information on the nature and cause of the accusation
Mexico’s Army and Air Force Manual (2009), in a section on the 1949 Geneva Convention III, states: “Judicial procedure must be regular, that is, it must include at least the following guarantees: the accused must be immediately informed of the particulars of the offence he is alleged to have committed”. 
Mexico, Manual de Derecho Internacional Humanitario para el Ejército y la Fuerza Área Mexicanos, Ministry of National Defence, June 2009, § 191.
In a section on the obligations of the occupying power under the 1949 Geneva Convention IV, the manual also states:
C. Judicial procedure must be regular, that is, it must include at least the following guarantees:
a. the accused must be immediately informed of the particulars of the offence he is alleged to have committed. 
Mexico, Manual de Derecho Internacional Humanitario para el Ejército y la Fuerza Área Mexicanos, Ministry of National Defence, June 2009, § 238(C)(a).