Article 4

1. The alphabetical list of goods and the explanatory notes adopted by the Committee of Experts, as well as any amendment or addition to the international classification decided by the Committee, shall be communicated to the Offices of the countries of the Special Union by the International Bureau. The decisions of the Committee of Experts shall enter into force as soon as the communication is received. Nevertheless, if such decisions entail the setting up of a new class or any transfer of goods from one class to another, they shall enter into force within a period of six months from the date of said communication.

2. The International Bureau, as depositary of the international classification, shall incorporate therein the amendments and additions which have entered into force. Announcements of the amendments and additions shall be published in the periodicals to be designated by the Assembly.