Article 4

1. Changes decided upon by the Committee of Experts and recommendations of the Committee of Experts shall be notified to the competent Offices of the countries of the Special Union by the International Bureau. Amendments shall enter into force six months after the date of dispatch of the notification. Any other change shall enter into force on a date to be specified by the Committee of Experts at the time the change is adopted.

2. The International Bureau shall incorporate in the Classification the changes which have entered into force. Announcements of those changes shall be published in such periodicals as may be designated by the Assembly referred to in Article 5.