One of only a few knocks against Lions quarterback Matthew Stafford has been occasional inaccuracy. His penchant for throwing deep and taking chances on the field often results in incompletions.

But Stafford hit on 60.3 percent of his passes a year ago, the second-best rate of his career. And Jim Caldwell believes that will improve this year. His work in offseason practices have provided encouragement.

"He's improved," Caldwell told MLive.com. "He has a better feel for the system. You can see our timing's better, receivers have a better sense of the routes that they're running. All around I think we've made some improvement."

Caldwell added that he anticipates Stafford will improve his completion percentage in 2015.