CONTRIBUTING.md

@@ -50,6 +50,7 @@ The techstack we operate on is
 - [typst] for documents and concrete proposals
 - [Rust] for the actual code
 - [Inkscape], [GIMP] and [Blender] for promotional material like logos and posters
+- [Penpot] for layouting prototypes and the like
 
 So if you want to contribute functionality, take a look at [The Rust Programming Language book]!
 If you want to contribute thoughts and techincal designs, then consider taking a ride through
@@ -61,6 +62,7 @@ If you want to contribute art or the like, do that in whatever **you** are most
 [Inkscape]: https://inkscape.org/ 
 [GIMP]: https://www.gimp.org/
 [Blender]: https://www.blender.org/
+[Penpot]: https://penpot.app/
 [The Rust Programming Language book]: https://doc.rust-lang.org/book/
 [typst's excellent tutorial]: https://typst.app/docs/tutorial