Prior to Le Classique, Cavani had been out with a hamstring injury, but came off the bench to grab a goal on his return to the Parisian side.
"It was great, a fantastic moment because it's always special to play against Marseille - in Le Classique," Cavani told beIN Sport.
"I really wanted to play and the medical staff did everything they could for me to able to come back because it was really important.
"To be able to come on for the final minutes and then even score a goal, it felt amazing, really incredible."
PSG currently hold top spot in the Ligue 1 table on 73 points.