diff --git a/wxPython/src/_app.i b/wxPython/src/_app.i
index 91d1a8fb8b..bef4d71056 100644
--- a/wxPython/src/_app.i
+++ b/wxPython/src/_app.i
@@ -228,7 +228,7 @@ explicitly from somewhere.", "");
     
     
     DocDeclStr(
-        void, SetUseBestVisual( bool flag ),
+        void, SetUseBestVisual( bool flag, bool forceTrueColour = false  ),
         "Set whether the app should try to use the best available visual on
 systems where more than one is available, (Sun, SGI, XFree86 4, etc.)", "");