I had started a journal of them in a three ring binder. Haven't kept up with it. But do have pictures of all my quilts and still know enough to catch it up.
My DH's aunt got me started on that.
Other info that she includes in her journals are:
her favorite instructors, classes she has taken, or taught, how she got her start, and any other information that her kids, grandkids and others would find interesting as they see or have her quilts.
I had even kept pieces of the fabrics I used in the quilts which is nice to have if you give the quilt away or sell it. You will have the picture as well as the fabric.