diff --git a/wxPython/src/_bitmap.i b/wxPython/src/_bitmap.i
index ce142978dd..83fa392e75 100644
--- a/wxPython/src/_bitmap.i
+++ b/wxPython/src/_bitmap.i
@@ -208,7 +208,8 @@ file or explpicitly set for the bitmap.
 
 :see: `SetMask`, `wx.Mask`
 ", "");
-    
+
+    // MSW only?    wxBitmap GetMaskBitmap() const;
 
     DocDeclStr(
         virtual void , SetMask(wxMask* mask),