En ændring af de i stk. 1 nævnte artikler træder i kraft en måned efter, at tre fjerdedele af de kontraherende parter, der på tidspunktet for ændringens vedtagelse var medlemmer af forsamlingen og havde ret til at stemme om den pågældende ændring, skriftligt og i overensstemmelse med deres respektive forfatningsmæssige regler har meddelt generaldirektøren, at de accepter ændringen, jf. dog litra b).
Except where subparagraph (b) applies, any amendment to the Articles referred to in paragraph (1) shall enter into force one month after written notifications of acceptance, effected in accordance with their respective constitutional processes, have been received by the Director General from three-fourths of those Contracting Parties which, at the time the amendment was adopted, were members of the Assembly and had the right to vote on that amendment.