Treasury Secretary Janet Yellen on Thursday helped mark a milestone in U.S. history when she held up a newly minted $5 bill signed for the first time ever by two women. Yellen's signature will appear alongside that of U.S. Treasurer Lynn Malerba, the first Native American in that position. Yellen joked during a stop in Texas about the bad handwriting of some of her male predecessors and said, "I will admit, I spent some quality time practicing my signature." "Two women on the currency for the first time is truly momentous," added Malerba, who traveled with Yellen to a Bureau of Engraving and Printing facility in Forth Worth to provide their signatures. They ceremonially signed fresh sheets of bills in $1 and $5 denominations and posed with samples to mark the history-making moment. The new notes will go into circulation next year.