Probably everybody else but me knew this technique for making labels, but until I read this, I struggled with just turning under the edges of the label, and since I was using a computer-printed label, the fabric was stiff and contrary, and I could never achieve a smooth straight edge. this is a link to a tutorial for making a framed label with a border, and then attaching a backing, so all the edges have a nice seam. For the computer label fabric, this results in the label lying flat (because the seams are pressed outward, so also reduces bulk. It's so important to label your quilt, and this makes it easy. Here's the link: http://sewmeblog.blogspot.com/2011/12/simple-quilt-label-tutorial.html
I would add one more tip. this tutorial suggests leaving one of the seams slightly open for turning. Other tutorials have you sew all around, and to flip, just cut a slit in the lining fabric and use that for turning. The slit won't show or ravel since it is behind the label.