diff --git a/pep-0409.txt b/pep-0409.txt
index 4cb734722..0451d469c 100644
--- a/pep-0409.txt
+++ b/pep-0409.txt
@@ -153,12 +153,17 @@ The default exception printing routine will then:
 
 In both of the latter cases the exception chain will stop being followed.
 
-Because the default value for ``__cause__`` is now ``Ellipsis``::
+Because the default value for ``__cause__`` is now ``Ellipsis`` and ``raise
+Exception from Cause`` is simply syntactic sugar for::
+
+    _exc = NewException()
+    _exc.__cause__ = Cause()
+    raise _exc
+
+``Ellipsis``, as well as ``None``, is now allowed as a cause::
 
     raise Exception from Ellipsis
 
-is allowed and will (re)set ``__cause__`` to ``Ellipsis``.
-
 
 Patches
 =======