Today I changed the strings on my strat, which is one of those things that frustrates me enough as it is. By the time I got 'em all off, I noticed something that frustrated me even more: a little groove worn into the neck at the 6th fret, apparently from the low E string:


I was just wondering, how bad is it that this has happened? Obviously I will try to be more careful with my playing from now on, but is it going to be a huge problem?