Artikel XX

(a). The Council may recommend amendments to the present Convention to the Contracting Parties.
(b). Any Contracting Party accepting an amendment shall notify the Belgian Ministry of Foreign Affairs in writing of its acceptance and the Belgian Ministry of Foreign Affairs shall notify all signatory and acceding Governments and the Secretary General of the receipt of the notice of acceptance.
(c). An amendment shall come into force three months after receipt by the Belgian Ministry of Foreign Affairs of notice of acceptance by all the Contracting Parties. When any amendment has been accepted by all the Contracting Parties the Belgian Ministry of Foreign Affairs shall notify all signatory and acceding Governments and the Secretary General of such acceptance and of the date on which the amendment will come into force.
(d). After an amendment has come into force, no Government may ratify or accede to the present Convention unless it also accepts the amendment.