(Larry Downing/Reuters)

White House Chief of Staff Jack Lew might have just gotten the official nod to be Treasury secretary. But the plum job came with an assignment from the Big Boss.

President Obama joked Thursday that his offer was conditional on Lew’s promise to work on his penmanship (after news reports, including the Loop’s, poked fun at his oddball signature that will likely grace dollar bills).

“I had never noticed Jack’s signature, and when this was highlighted yesterday in the press, I considered rescinding my offer to appoint him,” Obama said in concluding the public announcement. “Jack assures me that he is going to work to make at least one letter legible in order not to debase our currency should he be confirmed as Secretary of the Treasury.”