Philippe Saint-André knows France have to improve but was satisfied with their opening win over Italy at Twickenham.
Rabah Slimani and Nicolas Mas scored their first Test tries in the 32-10 win, but the game was marked by an endless string of penalties, with the Italians struggling to stay on the right side of Craig Joubert.
France lost winger Yoann Huget to a serious knee injury, putting a sour note on the game, and will have to quickly turn their attention to Wednesday's clash with Romania.
"The game was difficult and physical, as expected," said Saint-André.
"The Italians defended well. But we were solid and serious, even if we know we can do better. If we want to win the group we need to win our next three games, starting with Wednesday's game against Romania. They are starting the competition, so it will be hard. Recovery is key now.
"We were powerful and controlled the game. The Italians gave away a lot of penalties and we struggled for quick ball. Sometimes we lacked patience and tried impossible passes.
"But the players tried, it was important to kick off the tournament. And Twickenham was French, I heard la Marseillaise all game. I want to thank the supporters for that.
"We know we can do better and of course we would have loved to get a bonus point, but we didn't. We won't dwell on the game. We won, we'll close the book and move forward."