Building a million-dollar portfolio may feel like an impossible task. You might think it requires complex investment strategies and sophisticated portfolio management. But a single investment recommendation from Warren Buffett may be all you need to become a millionaire.

Buffett's top recommendation for any investor, whether novice or experienced veteran, is the same: an S 500 index fund. He specifically likes the Vanguard S 500 ETF (NYSEMKT: VOO). He has good reason for recommending an index fund, even over his own company's stock, Berkshire Hathaway (NYSE: BRK.A) (NYSE: BRK.B), which he believes will continue to outperform the index, albeit only slightly. Here's why he likes the Vanguard S 500 ETF so much and how it can make you a millionaire investor.

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Source Fool.com