Buhari also honoured Abiola's running mate in the June 12, 1993 election, Baba Gana Kingibe, and Gani Fawehinmi for his role in the poll.
The declaration was to honour MKO Abiola, the presumed winner of the acclaimed June 12, 1993 election, who was also awarded a posthumous title of Grand Commander of the Federal Republic (GCFR).
Many Nigerians have taken to Twitter to commend the President for making the historic move which past presidents, including Olusegun Obasanjo, failed to do.
Some, however, think the declaration is a way of appeasing the South West region and win their hearts ahead of the 2019 election.
See some of the reactions below: