118 Article 24 The Committee shall submit an annual report on its activities under this Convention to the States Parties and to the General Assembly of the United Nations. PART III Article 25 1. This Convention is open for signature by all States. 2. This Convention is subject to ratification. Instruments of ratification shall be deposited with the Secretary-General of the United Nations. Article 26 This Convention is open to accession by all States. Accession shall be effected by the deposit of an instrument of accession with the Secretary General of the United Nations. Article 27 1. This Convention shall enter into force on the thirtieth day after the date of the deposit with the Secretary-General of the United Nations of the twentieth instrument of ratification or accession. 2. For each State ratifying this Convention or acceding to it after the deposit of the twentieth instrument of ratification or accession, the Convention shall enter into force on the thirtieth day after the date of the deposit of its own instrument of ratification or accession. Article 28 1. Each State may, at the time of signature or ratification of this Convention or accession thereto, declare that it does not recognize the competence of the Committee provided for in article 20. 2. Any State Party having made a reservation in accordance with paragraph I of this article may, at any time, withdraw this reservation by notification to the Secretary-General of the United Nations. Article 29 1. Any State Party to this Convention may propose an amendment and file it with the Secretary-General of the United Nations. The Secretary General shall thereupon communicate the proposed amendment to the States Parties with a request that they notify him whether they favour a conference of States Parties for the purpose of considering and voting upon the proposal. In the event that within four months from the date of such communication at least one third of the States Parties favors such a conference, the Secretary General shall convene the conference under the auspices of the United Nations. Any amendment adopted by a majority of the States Parties present and voting at the conference shall be submitted by the SecretaryGeneral to all the States Parties for acceptance.