Walker hit a wonder free-kick in the 2-0 win.
He told Sky Sports: "I don't practice them or anything. I just felt it was right, you know, when you get a feeling, and luckily it went in.
"I think you always need that second goal just to ease the pressure and then you can just pass it around and keep composed.
"But I thought it was a good team performance all around, from back to front, and we just take that into the next game, really."