context is keyword-only
diff --git a/Doc/library/xmlrpc.client.rst b/Doc/library/xmlrpc.client.rst
index 87ac86a..cc5e83a 100644
--- a/Doc/library/xmlrpc.client.rst
+++ b/Doc/library/xmlrpc.client.rst
@@ -34,7 +34,7 @@
 
 .. class:: ServerProxy(uri, transport=None, encoding=None, verbose=False, \
                        allow_none=False, use_datetime=False, \
-                       use_builtin_types=False, context=None)
+                       use_builtin_types=False, *, context=None)
 
    .. versionchanged:: 3.3
       The *use_builtin_types* flag was added.