diff --git a/Demo/rpc/README b/Demo/rpc/README
index be75c104009..8165ce020d2 100644
--- a/Demo/rpc/README
+++ b/Demo/rpc/README
@@ -1,6 +1,8 @@
 This is a Python interface to Sun RPC, designed and implemented mostly
 by reading the Internet RFCs about the subject.
 
+*** NOTE: xdr.py has evolved into the standard module xdrlib.py ***
+
 There are two library modules, xdr.py and rpc.py, and several example
 clients: mountclient.py, nfsclient.py, and rnusersclient.py,
 implementing the NFS Mount protocol, (part of) the NFS protocol, and