Sign the back of the block

I'll try to remind you later, before you mail the blocks back to me.

I was putting together the Pixie Dust quilt today, and I realized, Doris,
always very nicely, signs her name on a seam on the back of her block.

This would help me tremendously in keeping track of who sent what block...

Could you all do this to your blocks before you send them back to me?

Great pens...
Micron size 01 or o2 are very good.
I have blue and black, they are archival, acid free, waterproof and fade proof.
any stationery store or art supply or quilt shop usually have them...