Many investors see a great dividend, and don't ask questions. But the smart investor knows that for a dividend to be sustainable, it has to be coming from the right places. In this video, Motley Fool energy analyst Joel South tells us what to look for at Enterprise Products Partners (NYSE: EPD) to understand the company's continued sustainability and growth in its distributions to shareholders. He highlights the company's focus on both growth and stable income projects, not only to continue distributions to shareholders at this level, but to increase them.