Answer: First of all you heard right. And second of all, you just averted a small disaster by asking this question.
1. Even though tiles are hard like concrete and masonry, the last thing you want to do is use a drill with an impact mechanism like a hammer drill. Tile is too brittle and will probably break if you apply drilling pressure with a hammer drill.
2. However, you do want to use a masonry drill bit.
Click below to read more on DIYNetwork.