46. The Convention is open for signature on behalf of States members of the Bank. It will also be open for signature on behalf of any other State which is a party to the Statute of the International Court of Justice and which the Administrative Council, by a vote of two-thirds of its members, shall have invited to sign. No time limit has been prescribed for signature. Signature is required both of States joining before the Convention enters into force and those joining thereafter (Article 67). The Convention is subject to ratification, acceptance or approval by the signatory States in accordance with their constitutional procedures (Article 68). As already stated, the Convention will enter into force upon the deposit of the twentieth instrument of ratification, acceptance or approval.