Convention and protocol 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 onthe 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 SecretaryGeneral 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 an d 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 favours 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 Secretary-General to all the States Parties for acceptance. 2. An amendment adopted in accordance with paragraph 1 of this article shall enter into force when two thirds of the States Parties to this Convention have notified the SecretaryGeneral of the United Nations that they have accepted it in accordance with their respective constitutional processes. 3. When amendments enter into force, they shall be binding on those States Parties which have accepted them, other States Parties still being bound by the provisions of this Convention and any earlier amendments which they have accepted. National Preventive Mechanism in the Republic of Slovenia under the Optional Protocol to the UN Convention against Torture and Other Cruel, Inhuman or Degrading Treatment or Punishment 95