Article 12(3) of the Lusaka Final Act, states that the “Agreement shall remain open for accession by any African state”. Consequently, all African countries are eligible for membership to the Lusaka Agreement for as long as they accept and comply with their obligations under it.
For a country to become a Party, its instruments of ratification, acceptance, approval or accession must be deposited with the Secretary-General of the United Nations who will notify the Parties on  the same.