Derbyshire left-arm spinner David Wainwright has signed a four-year deal.
The Yorkshire-born bowler has
made a big impact since joining last September,
taking 27 wickets at 27 apiece and helping the side
top the Division Two table in the Championship.
Head coach Karl Krikken said: "David's performances have been magnificent. He's been a key element in our success.
"A spinner who can take wickets or bowl containing spells is so important to any team."
Krikken added: "David has proved himself well capable of carrying out both roles to perfection."