The duo, who were both drafted by the Cincinnati Bengals in 2011, have connected for 18 touchdowns in two seasons.
The quarterback told reporters: "I know we've done some big things since we've been here. Our goal for both of us is to keep getting better, keep finding ways to work at our position and what we do.
"Hopefully as time goes on we keep improving and keep getting better, and just the more experience, the more that we're playing, the more that we're able to do.
"There were different guys last year at different points of the season that were in. There's a comfort level of knowing where guys are going to be, how guys run routes and things like that. It should make us better going into this year."
The Bengals face the Chicago Bears on Sunday.