Do I requirement a stepdown transformer for an apple macBook when I do international travel?

I read on the specs that the mac supports 100-220v and 50-60Hz. I know that I'm traveling to a place that uses 220v and a three prong plug. My guess is that an adapter will suffice, but I purely want to make sure. I read somewhere that some apple products automatically adjust for different charges and others require you to set something to work beside different voltages. What's the real promise?

Answer:
All you need is an adapter !

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