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 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 Secretary-General 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.