Karim Benzema scored twice, including one from the penalty spot, as Les Bleus opened their group with a comfortable win on Sunday evening.
"We are happy. It was a good game and getting the three points was fundamental," AS reports the Real Sociedad attacker as saying.
"The key to the first game is winning. Now is the time to rest and work for the next match. Benzema is a great player and we all know that. Today was his day."
France last won the World Cup in 1998.