The first Lord of the Rings film will carry a warning that it might be too scary for children under eight.
The Fellowship of the Ring has been given a PG rating which means kids of any age can go and see it without an adult.
But it also means some scenes in JRR Tolkein's fantasy might not be suitable for under-eights.
The British Board of Film Classification which gives out the ratings, says some of the battle and horror scenes might be too frightening.
But they say it's not bad enough to need a '12' rating, so instead they're putting a special warning on to explain it's "at the top end of a PG".
Only Jurassic Park and its sequel have had this warning before.
The eagerly-awaited film goes on
general release on 19 December and ticket sales could even out-sell Harry Potter and the Philosopher's Stone.