Pan Macmillan announced Tuesday it has secured the U.K. and Commonwealth rights to publish the sequel to Nelson Mandela’s autobiography, Long Walk to Freedom. The posthumous publication of the sequel, which is based on a handwritten manuscript by Mandela, details his life as South Africa’s first black president. Mandela, who died at age 95 in 2013, began working on the sequel in 1998 and produced around 23,000 words. About a third of the book will be Mandela’s text while the rest will be written by contributors, including two of Mandela’s former heads of communications during his presidency. The sequel is expected to hit shelves next year.