diff --git a/docs/reference/gdk/gdk3-sections.txt b/docs/reference/gdk/gdk3-sections.txt
index f90c0c08b3..3b052218c9 100644
--- a/docs/reference/gdk/gdk3-sections.txt
+++ b/docs/reference/gdk/gdk3-sections.txt
@@ -989,6 +989,7 @@ gdk_x11_window_set_hide_titlebar_when_maximized
 gdk_x11_window_set_theme_variant
 gdk_x11_window_set_user_time
 gdk_x11_window_move_to_current_desktop
+gdk_x11_window_set_utf8_property
 gdk_x11_get_default_root_xwindow
 gdk_x11_get_default_screen
 gdk_x11_get_default_xdisplay