The Yorkshireman already had two top-flight titles under his belt when he joined the Reds from Manchester City on a free transfer in the summer of 2015.
“It's always special as it's incredibly difficult to do," he told the club's official website.
“But how long this club has waited and how desperate they were for it, you see the history, all the times they've won it before and the Wall of Champions.
“I've said a number of times to you guys how desperate I was to change the numbers on that board and to be able to do it a few times in a year is great and special.
“It's special when you're driving around the city and seeing the flags outside people's houses and how much it means to everyone. It means a lot to us because it's what we've been striving to achieve as a group.
“The fans have waited so long and you think of the different generations: people have seen it before and have been desperate for it to happen again; fans who weren't born the last time it happened and have heard about all this success but have never seen it themselves.
“When you think about those generations, it does make it special and you feel proud to be a part of it."