Lacelady

I machine embroider too. I put the name of the quilt, my name, I add the word 'copyright' if it is mine, and the date, then the size (handy if you want to enter it into shows) and finally my email address. I always sew it to the bottom left corner (when looking at the wrong side), so that I know it is in the bottom right corner from the right side.

In the attached photo, the wording was different, because I was doing it for a group quilt, but this will give you the general idea.