If you have an artist put a personal message on a work of art you buy, will this reduce any resale value?

We are buying from a small boutique artist in the US who has offered to personalize the work for us. While this would enhance the personal value for us, we fear that if the artist ever became big and the art went up in value, the personal message could hurt any resale value or even make it unsellable. We'd be grateful for replies from people working in the art world.