The Reds were 3-0 ahead at half time and the win means they are now top of the Premier League.
"I think we dominated the first half, but I still think we can be better. Overall, we are delighted with the three points," he told Sky Sports News.
"I think you've got to give Crystal place credit. We will be a little bit disappointed because we said at half time we wanted to pick the pace up and get a few more goals.
"We need to keep our feet on the ground. We can still improve and play a lot better. There are positive signs, but we've got to keep winning games and keep dominating games."
Liverpool are up against Newcastle United in a fortnight.