alignment under warranty

[psywzrd]

I took my H3 to the dealership this morning for an oil change and tire rotation was told that I needed an alignment as well. My H3 has never been off-road (no comments from the peanut gallery please ) and it has just over 15k miles on it. Does this seem right to you guys? I don't doubt that it needs the alignment (the front tires are clearly more worn on the outside) but shouldn't something like this be covered under warranty? Or is this considered more of a "wear and tear" type thing? I don't recall ever having an alignment done on any other vehicle I've owned, let alone at 15,000 miles. Any help is appreciated as I am going to pick the vehicle up shortly. Thanks!