4. The Secretary-General shall notify the States members of the deposit of each instrument of ratification or accession. Article 50 Any State party may submit written proposals, though the Secretary-General, for the amendment of the present Charter. After these amendments have been circulated among the States members, the Secretary-General shall invite the States parties to consider the proposed amendments before submitting them to the Council of the League for adoption. Article 51 The amendments shall take effect, with regard to the States parties that have approved them, once they have been approved by two thirds of the States parties. Article 52 Any State party may propose additional optional protocols to the present Charter and they shall be adopted in accordance with the procedures used for the adoption of amendments to the Charter. Article 53 1.  Any State party, when signing this Charter, depositing the instruments of ratification or acceding hereto, may make a reservation to 32