This year's top-performing mutual funds aren't necessarily going to be next year's best performers. It’s not uncommon for a fund to have better-than-average performance one year and mediocre or below-average performance the following year. That's why the SEC requires funds to tell investors that a fund's past performance does not necessarily predict future results. You can learn what factors to consider before investing in a mutual fund by reading Mutual Fund Investing: Look at More Than a Mutual Fund's Past Performance. You can also learn more about investment performance claims by reading Investor Bulletin: Performance Claims.