Mode of altering provisions of the Constitution
Section 9(2) · 1999 Constitution (2004 edition)
What Constitution says
(2) An Act of the National Assembly for the altertion of this Constitution, not being an Act to which section 8 of this Constitution applies, shall not be passed in either House of the National Assembly unless the proposal is supported by the votes of not less than two-thirds majority of all the members of that House and approved by resolution of the Houses of Assembly of not less than two-thirds of all the States.
This is the 1999 Constitution as published in 2004. Later amendments aren't included yet, so a section may have changed since.
Original source
Official Gazette · CFRN 1999 official PDF · printed page 24. Original document
Release: draft-c8d50d87fae9. Source scope, review and corrections