diff --git a/gtk/gtknotebook.c b/gtk/gtknotebook.c
index e5774649e6..ca665da20a 100644
--- a/gtk/gtknotebook.c
+++ b/gtk/gtknotebook.c
@@ -137,6 +137,8 @@
  * reorderable pages, the tab node gets the .reorderable-page class.
  *
  * A tab node gets the .dnd style class while it is moved with drag-and-drop.
+ *
+ * The nodes are always arranged from left-to-right, regarldess of text direction.
  */