Artikel 13

1. Annexes I and II to this Agreement may be amended in accordance with the procedure laid down in this article.
2. At the request of a Contracting Party, any amendment proposed by it to annexes I and II to this Agreement shall be considered by the Working Party on Inland Water Transport of the United Nations Economic Commission for Europe.
3. If the proposed amendment is adopted by the majority of the Contracting Parties present and voting, it shall be communicated by the Secretary-General of the United Nations to the Contracting Parties directly concerned for acceptance. For the purpose of this article, a Contracting Party shall be considered directly concerned if, in the case of inclusion of a new inland waterway or port of international importance or in the case of their respective modification, its territory is crossed by that inland waterway or if the considered port is situated on the said territory.
4. Any proposed amendment communicated in accordance with paragraphs 2 and 3 of this article shall be deemed accepted if, within a period of six months following the date of its communication by the depositary, none of the Contracting Parties directly concerned has notified the Secretary-General of the United Nations of its objection to the proposed amendment.
5. Any amendment thus accepted shall be communicated by the Secretary-General of the United Nations to all Contracting Parties and shall enter into force three months after the date of its communication by the depositary.
6. If an objection to the proposed amendment has been notified in accordance with paragraph 4 of this article, the amendment shall be deemed not to have been accepted and shall have no effect whatsoever.
7. The depositary shall be kept promptly informed by the secretariat of the Economic Commission for Europe of the Contracting Parties which are directly concerned by a proposed amendment.