diff --git a/README.md b/README.md
index ccbc853..b3a7087 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,17 @@
 
 A timer that notifies you - even if "do not disturb" is enabled.
 
+## ToC
+
+<!-- TOC -->
+* [DnDBuster](#dndbuster)
+  * [ToC](#toc)
+  * [Application IDs](#application-ids)
+  * [.desktop entry](#desktop-entry)
+  * [Alternatives](#alternatives)
+  * [GTK resources](#gtk-resources)
+<!-- TOC -->
+
 ## Application IDs
 
 https://developer.gnome.org/documentation/tutorials/application-id.html
@@ -54,3 +65,8 @@ nix-shell -p libnotify
 sleep 30m
 notify-send -u critical -a PleaseDisturbTimer "Alert" "Time is over!"
 ```
+
+## GTK resources
+
+- https://www.technett.io/post/dev/python-gtk-2/
+- https://github.com/Taiko2k/GTK4PythonTutorial?tab=readme-ov-file