diff --git a/readme.md b/readme.md
index c53d617..5e466c6 100644
--- a/readme.md
+++ b/readme.md
@@ -6,6 +6,6 @@ It was worth every penny of the $50 (including tax and shipping) I got it for on
 
 The printer is an EPSON TM-m30-NT-II. It's CUPS drivers are packaged in [my NixOS configuration here](https://github.com/Infinidoge/universe/blob/master/pkgs/tmx-cups-ppd.nix).
 
-The focal point of my experiments has been [my custom printer class](./printer.py), which adds context managers and other goodies to make creating custom receipts easier.
+The focal point of my experiments has been [my custom printer class](./printer.py) derived from [python-escpos](https://github.com/python-escpos/python-escpos), which adds context managers and other goodies to make creating custom receipts easier.
 
 If you have any suggestions on things to print, feel free to [ping me on Mastodon](https://meow.social/@Infinidoge) or some of the other places on [my website](https://inx.moe) :)