Dividend exchange traded funds (ETFs) are a good fit in any portfolio. But an investor should know the sector weightings included in dividend ETFs, lest you get bitten when a highly weighted sector does poorly.

Investors interested in dividend ETFs should watch out for large sector distributions, most notably sector exposure in financials, comments Roger Nusbaum for TheStreet. Having a fund with a high exposure to financials is fine, but it might not be such a good thing if other funds in a portfolio also include high financial exposure. It also may be exposure that you, personally, don’t want in your portfolio.

Long-term investment in dividends has its perks. The stock market has seen an average annual return of around 10% in the long run, and 40% of that return has been generated by dividends.

Since the latest financials-induced migraine, dividend funds have decreased weightings in financials or even eliminated them altogether.

iShares Dow Jones Select Dividend Index (NYSEArca: DVY): up 2.9% year-to-date; decreased its weight in financials to 14% down from its original 40%. The reason for the reduction is because some financial companies have either suspended or cut their dividends. Now the largest allocation is in utilities, at 24%, followed by industrials, at 20%, and consumer goods, at 17%.