109As the Court of First Instance stated in paragraph 99 and the first sentence of paragraph 100 of the contested judgment, the extension of the guarantees attaching to the SNCI loans for a further three-year period served to modify the aid which had been approved, so that the authorisation decisions of 1982 and 1985, which the Belgian authorities did not cite during the administrative procedure, could no longer in any case legitimately cover the guarantees which had been agreed. That significant modification of the procedure for repaying the SNCI loans should therefore have been notified to the Commission in accordance with Article 6(2) of the Fifth Code and, in the absence of such a notification, the extension of those guarantees constituted illegal aid. The reasons set out in paragraph 99 and the first sentence of paragraph 100 of the contested judgment are therefore sufficient to justify the finding that the Commission treated the aid at issue as illegal aid which was not authorised under earlier decisions.