On 28 June 1999, the Government of Portugal informed the Secretary-General that the Convention would also apply to Macao.
Subsequently, the Secretary-General received communications concerning the status of Macao from Portugal and China:
Portugal (9 December 1999):
"In accordance with the Joint Declaration of the Government of the Portuguese Republic and the Government of the People's Republic of China on the Question of Macau signed on 13 April 1987, the Portuguese Republic will continue to have international responsibility for Macau until 19 December 1999 and from that date onwards the People's Republic of China will resume the exercise of sovereignty over Macau with effect from 20 December 1999.
From 20 December 1999 onwards the Portuguese Republic will cease to be responsible for the international rights and obligations arising from the application of the Convention to Macau."
China (15 December 1999):
"In accordance with the Joint Declaration of the Government of the People's Republic of China and the Government of the Republic of Portugal on the Question of Macau (hereinafter referred to as the Joint Declaration), the Government of the People's Republic of China will resume the exercise of sovereignty over Macau with effect from 20 December 1999. Macau will, from that date, become a Special Administrative Region of the People's Republic of China and will enjoy a high degree of autonomy, except in foreign and defense affairs which are the responsibilities of the Central People's Government of the People's Republic of China."
Upon resuming the exercise of sovereignty over Macao, China notified the Secretary-General that the Convention will also apply to the Macao Special Administrative Region.