diff --git a/readme.md b/readme.md
index 1939651..7a75496 100644
--- a/readme.md
+++ b/readme.md
@@ -2,6 +2,6 @@ this is a rust zine that provides an introduction to the language if you don't h
 
 - html: <https://licynthiax.gitlab.io/rust-zine>, screenreader-accessible version + working links.
 - pdf: rust-zine.pdf, to download and read.
-- pdf (printable flavor): rust-zine-printable.pdf, print (double-sided!), put all the pages on top of each other, fold in half, and staple.
+- pdf (printable flavor): rust-zine-printable.pdf, print (double-sided!), put all the pages on top of each other, fold in half, and staple. (made with <https://jywarren.github.io/bookletize.js/>)
 
 please don't share publicly outside of the 5Cs, thanks