diff --git a/docs/reference/gtk/tmpl/gtkwindowgroup.sgml b/docs/reference/gtk/tmpl/gtkwindowgroup.sgml
index 71bd142abd..93368142ec 100644
--- a/docs/reference/gtk/tmpl/gtkwindowgroup.sgml
+++ b/docs/reference/gtk/tmpl/gtkwindowgroup.sgml
@@ -6,7 +6,13 @@ Limit the effect of grabs
 
 <!-- ##### SECTION Long_Description ##### -->
 <para>
-
+#GtkWindowGroup objects are referenced by each window in the group,
+so once you have added all windows to a #GtkWindowGroup, you can drop
+the initial reference to the window group with g_object_unref(). If the
+windows in the window group are subsequently destroyed, then they will
+be removed from the window group and drop their references on the window
+group; when all window have been removed, the window group will be
+freed.
 </para>
 
 <!-- ##### SECTION See_Also ##### -->