Yup! If anything ever happens to your computer and you take it into Apple, they'll blame it on the drop. Apple told me my $3 fan cost $1200 to replace.
What you can do is get it checked out by a Genius with the damage. If everything is in working order, they can notate it on your serial number. It certainly isn't a guarantee that Apple won't use the damage as an excuse to not cover your laptop under warranty in the future, but it couldn't hurt, especially if you get a gracious Genius.
will be covered if something should happen in the future.