diff --git a/CHANGES.rst b/CHANGES.rst
index 1cc81513..e1cad71d 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -9,6 +9,15 @@ wxPython Changelog
 ==================
 
 
+4.0.0b2
+-------
+* (not yet released)
+
+Added a deprecated compatibility helper for wx.CustomDataFormat.
+
+
+
+
 4.0.0b1
 -------
 * 22-July-2017
diff --git a/etg/dataobj.py b/etg/dataobj.py
index a3d12fd1..5d48326d 100644
--- a/etg/dataobj.py
+++ b/etg/dataobj.py
@@ -162,6 +162,11 @@ def run():
     module.items.remove(item)
     module.insertItemAfter(c, item)
 
+    module.addPyCode("""\
+        def CustomDataFormat(format):
+            return wx.DataFormat(format)
+        CustomDataFormat = wx.deprecated(CustomDataFormat, "Use wx.DataFormat instead.")
+        """)
 
     #------------------------------------------------------------
     c = module.find('wxDataObject')