The fund’s investment objective is to seek to provide a high and sustainable level of current income that is exempt from federal personal income taxes. The fund invests at least 80% of its assets in investment-grade municipal bonds, as determined by a nationally recognized statistical rating organization or, if unrated, determined to be of comparable quality by the advisor. The fund may invest up to 20% of its assets in less-than-investment-grade bonds, as determined by a rating organization or by the advisor. The fund has no limitations on the maturity of individual securities but is expected to maintain a dollar-weighted average maturity of 10 to 25 years. This low-cost municipal bond fund seeks to provide a high level of federally tax-exempt income and typically appeals to investors in higher tax brackets. The fund’s lower credit quality may provide a higher yield, but it makes the fund more susceptible to price volatility due to uncertain prospects for the bond issuers. Investors who are looking for a fund that may provide sustainable federally tax-exempt interest income and can tolerate moderate risk to principal may wish to consider this fund as a complement to an already diversified fixed income portfolio.