[hcs]

I rarely write in a book besides my name in pencil in the front. But when I see an error that I can't ignore, I'll make a copyediting mark or note in the margin so I can move on. Very occasionally I'll get a book that I need to argue with, and then the margins get filled, sorry to anyone who eventually finds these.

I think my reluctance is mostly about keeping a book in the state I got it, since I do frequently mark up interesting sections of PDFs in my e-reader.