diff --git a/RESOURCES.md b/RESOURCES.md
index 6d8e98f..61e1dc3 100644
--- a/RESOURCES.md
+++ b/RESOURCES.md
@@ -20,6 +20,7 @@ These are various resources that'll be useful for working on Hermes.
 ## Frontend
 
 ### Documentation
+- [gtk4-rs Book](https://gtk-rs.org/gtk4-rs/stable/latest/book/)
 - [GNOME Human Interface Guidelines](https://developer.gnome.org/hig/)
 
 ### Software