Add XXX note about wanting support for copy_reg.py...
diff --git a/Lib/copy.py b/Lib/copy.py
index ef5b10e..ef15982 100644
--- a/Lib/copy.py
+++ b/Lib/copy.py
@@ -50,6 +50,8 @@
 "pickle" for information on these methods.
 """
 
+# XXX need to support copy_reg here too...
+
 import types
 
 error = 'copy.error'