1. Reservations referred to in Article 78, paragraphs 2 and 3, shall be valid for a period of five years from the day of the entry into force of this Convention in respect of the Party concerned. However, such reservations may be renewed for periods of the same duration.
2. Eighteen months before the date of expiry of the reservation, the Secretariat General of the Council of Europe shall give notice of that expiry to the Party concerned. No later than three months before the expiry, the Party shall notify the Secretary General that it is upholding, amending or withdrawing its reservation. In the absence of a notification by the Party concerned, the Secretariat General shall inform that Party that its reservation is considered to have been extended automatically for a period of six months. Failure by the Party concerned to notify its intention to uphold or modify its reservation before the expiry of that period shall cause the reservation to lapse.
3. If a Party makes a reservation in conformity with Article 78, paragraphs 2 and 3, it shall provide, before its renewal or upon request, an explanation to GREVIO, on the grounds justifying its continuance.