Artikel 13

1. Amendments to this Agreement may be proposed by either Party and shall be agreed to and shall enter into force under the same conditions as provided for under Section 16 of this Agreement.
2. Modifications to the Attachments to this Agreement, with the exception of Attachment 1 and Part B of Attachment 5, may be agreed upon in writing at any time between the representative of the OPCW and the representative of the inspected State Party, provided that both are specifically authorised to do so. Each Party to this Agreement may revoke its consent to a modification not later than four weeks after the modification has been agreed upon. After this time period has elapsed, the modification shall be deemed to meet the requirements of Section 16 of this Agreement.
3. Updates to Part A of Attachment 1 and Part B of Attachment 5 to this Agreement shall be made by the inspected State Party. Updates to Part B of Attachment 1 to this Agreement shall be made by the OPCW.