Artikel 18

Any State not represented at the Eleventh Session of the Hague Conference on Private International Law which is a Member of this Conference or of the United Nations or of a specialized agency of that Organisation, or a Party to the Statute of the International Court of Justice may accede to the present Convention after it has entered into force in accordance with the first paragraph of Article 17.
The instrument of accession shall be deposited with the Ministry of Foreign Affairs of the Netherlands.
The Convention shall enter into force for a State acceding to it on the sixtieth day after the deposit of its instrument of accession.
The accession will have effect only as regards the relations between the acceding State and such Contracting States as will have declared their acceptance of the accession. Such a declaration shall be deposited at the Ministry of Foreign Affairs of the Netherlands; this Ministry shall forward, through diplomatic channels, a certified copy to each of the Contracting States.
The Convention will enter into force as between the acceding State and the State having declared to accept the accession on the sixtieth day after the deposit of the declaration of acceptance.