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1. Each contracting State shall specify in its instruments of ratification, acceptance or approval, each regional or minority language, or official language which is less widely used on the whole or part of its territory, to which the paragraphs chosen in accordance with Article 2, paragraph 2, shall apply.
2. Any Party may, at any subsequent time, notify the Secretary General that it accepts the obligations arising out of the provisions of any other paragraph of the Charter not already specified in its instrument of ratification, acceptance or approval, or that it will apply paragraph 1 of the present article to other regional or minority languages, or to other official languages which are less widely used on the whole or part of its territory.
3. The undertakings referred to in the foregoing paragraph shall be deemed to form an integral part of the ratification, acceptance or approval and will have the same effect as from their date of notification.