Toronto-based Invesco Canada Ltd. announced Thursday that it has added two new series to PowerShares Senior Loan Index ETF.

The new series give investors the option of choosing the currency exposure that suits their goals, the firm’s news release says.

When this ETF first launched in 2012, it was limited to Canadian-dollar-hedged units. Investors can now also choose from unhedged units denominated in both U.S. and Canadian dollars, the firm says, noting that it’s the first ETF in Canada to provide unhedged exposure to senior loans.

“After many years of interest-rate stagnation, monetary policy appears to be tightening in the U.S., which may introduce greater volatility to the fixed-income market,” says Christopher Doll, vice president and head of product and business strategy of PowerShares Canada, in a statement. “Investors seeking to dampen the potential impact of rising rates may want to consider diversifying their fixed-income portfolios beyond traditional government and corporate bonds.”

The new series is now trading on the Toronto Stock Exchange.