Buhari made his feelings known in a statement issued by his Special Adviser on Media and Publicity, Femi Adesina, in Abuja on Thursday.
He noted that the recovery had raised renewed hope that the other captured girls would one day be reunited with their families, friends and community.
The president also commended the military for the diligent investigation which led to the discovery of Rakiya and urged them to continue in the spirit with which they cleared the Sambisa Forest of terrorists.
Buhari assured that the Nigerian Government would continue to do all within its powers to assist the military in locating the rest of the girls and eradicating the menace of terrorism in Nigeria.
With the recovery of Rakiya Abubakar, the rescued Chibok girls, in the last four months, are now 23.
The Federal Government in October successfully secured the release of the 21 Chibok school girls after months of negotiation with their captors.
Buhari had pledged to ensure the release of the remaining girls in captivity.