Backport from 3k: #1116: fix reference to old filename.
diff --git a/Doc/extending/extending.rst b/Doc/extending/extending.rst
index 4dff5b5..4a11d97 100644
--- a/Doc/extending/extending.rst
+++ b/Doc/extending/extending.rst
@@ -423,7 +423,7 @@
standard interface to call a Python function. (I won't dwell on how to call the
Python parser with a particular string as input --- if you're interested, have a
look at the implementation of the :option:`-c` command line option in
-:file:`Python/pythonmain.c` from the Python source code.)
+:file:`Modules/main.c` from the Python source code.)
Calling a Python function is easy. First, the Python program must somehow pass
you the Python function object. You should provide a function (or some other