Renunciation of citizenship
Section 29(1) · 1999 Constitution (2004 edition)
What Constitution says
(1) Any citizen of Nigeria of full age who wishes to renounce his Nigerian citizenship shall make a declaration in the prescribed manner for the renunciation.
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 32. Original document
Release: draft-c8d50d87fae9. Source scope, review and corrections