The Cottagers thumped London rivals QPR 6-0 at home on Sunday, with Johnson grabbing a het-trick in the rout.
“I always said there is a line between success and failure and this is what we did today,” he told Sky Sports.
“I felt we played very well from the start. I’m very satisfied. We created a lot of chances and today, Andy Johnson put the ball into the back of the net.
“Remember that both Johnson and [Bobby] Zamora were both out injured, so it was nice to see them play together well.
“That is what Johnson is capable of and that’s what I said at the start of the season. He’s quick, he wants to work and he’s a team player and now he proves that he can score goals as well and that is good.
“Probably, scoring six goals is maybe too much in a Premier League match but on the other hand we should have scored so many goals before in other matches,” he stated.
The victory lifts the Craven Cottage outfit up to 12th in the standings, on seven points from seven games.
By Gareth McKnight