diff --git a/ChangeLog b/ChangeLog
index 3ca5082f9..0670fdda9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2003-03-24  Jorn Baayen  <jorn@nl.linux.org>
+
+	* gtk/Gtk.metadata : mark null_ok param on Window.SetTransientFor.
+
 2003-03-24  Jorn Baayen  <jorn@nl.linux.org>
 
 	* gdk/Gdk.metadata : mark out param on Screen.GetMonitorGeometry.
diff --git a/gtk/Gtk.metadata b/gtk/Gtk.metadata
index f68e7964d..4a7c9de36 100644
--- a/gtk/Gtk.metadata
+++ b/gtk/Gtk.metadata
@@ -290,6 +290,7 @@
   <attr path="/api/namespace/object[@cname='GtkWindow']/method[@name='ListToplevels']" name="hidden">1</attr>
   <attr path="/api/namespace/object[@cname='GtkWindow']/method[@name='SetDefaultIconList']" name="hidden">1</attr>
   <attr path="/api/namespace/object[@cname='GtkWindow']/method[@name='SetIconList']" name="hidden">1</attr>
+  <attr path="/api/namespace/object[@cname='GtkWindow']/method[@name='SetTransientFor']/*/*[@name='parent']" name="null_ok">1</attr>
   <attr path="/api/namespace/object[@cname='GtkWindow']/property[@name='Screen']" name="new_flag">1</attr>
   <attr path="/api/namespace/object[@cname='GtkWindow']/signal[@name='ActivateDefault']" name="name">DefaultActivated</attr>
   <attr path="/api/namespace/object[@cname='GtkWindow']/signal[@name='ActivateFocus']" name="name">FocusActivated</attr>