diff --git a/gtk/gtknotebook.c b/gtk/gtknotebook.c
index 8f1366f9eb..825ffd6c10 100644
--- a/gtk/gtknotebook.c
+++ b/gtk/gtknotebook.c
@@ -115,9 +115,10 @@
  * │   │   ╰── [arrow]
  * │   ╰── [<action widget>]
  * │
- * ├── <child>
- * ┊
- * ╰── <child>
+ * ╰── stack
+ *     ├── <child>
+ *     ┊
+ *     ╰── <child>
  * ]|
  *
  * GtkNotebook has a main CSS node with name notebook, a subnode