Mention Py_RETURN_NONE when introducing the idiom of how to have a function

brettcannon · brettcannon · commit 634893d1a38e · 2004-06-27T04:28:00.000Z
return Py_None.
diff --git a/Doc/ext/extending.tex b/Doc/ext/extending.tex
@@ -290,7 +290,8 @@ \section{Back to the Example
 
 If you have a C function that returns no useful argument (a function
 returning \ctype{void}), the corresponding Python function must return
-\code{None}.   You need this idiom to do so:
+\code{None}.   You need this idiom to do so (which is implemented by the
+\csimplemacro{Py_RETURN_NONE} macro):
 
 \begin{verbatim}
     Py_INCREF(Py_None);
