If you haven’t already dropped all your cash on a Black Friday or CyberMonday gift, today is your chance to really spend some money, and ostensibly support a good cause.  Christie’s — the auction house where bidding typically starts about where your student loans are right now — is teaming up with the PEN American Center for “First Edition/Second Thoughts,” a charity auction of first editions that have been recently re-read and annotated by their authors.

Junot Diaz, Robert Caro, Marilynne Robinson, Philip Roth, Lydia Davis and 70 other authors and artists have looked back at their old works and added hand-written comments in the margins and elsewhere. Don DeLillo’s contribution, a 1997 edition of Underworld, features “four hundred pages of DeLillo’s handwritten notes, providing anecdotes, playful commentary, and his recollections of writing the book,” according to the New Yorker. “I found it interesting to become curious about something that I myself had written,” said DeLillo to the magazine, which also noted that the author communicates via fax.

The concept really is a cool one, and is among the few instances in which getting a “signed first edition” actually adds something to your reading. Here’s hoping there will be an opportunity in the future to read the annotations without having to bid the kind of money that would give any reasonable person, well, second thoughts*.

*Sorry.