diff -r 7ce22d0899e4 Doc/library/argparse.rst
--- a/Doc/library/argparse.rst	Fri Mar 14 21:54:41 2014 -0500
+++ b/Doc/library/argparse.rst	Wed Mar 19 07:37:08 2014 -0700
@@ -175,10 +175,9 @@
 prog
 ^^^^
 
-By default, :class:`ArgumentParser` objects uses ``sys.argv[0]`` to determine
-how to display the name of the program in help messages.  This default is almost
-always desirable because it will make the help messages match how the program was
-invoked on the command line.  For example, consider a file named
+By default, :class:`ArgumentParser` objects uses the base name of the path ``sys.argv[0]``, see :func:`~os.path.basename`, to determine
+how to display the name of the program in help messages.  This default is almost 
+always desirable because it will make the help messages use the same name that was used to invoke the program on the command line.  For example, consider a file named
 ``myprogram.py`` with the following code::
 
    import argparse
@@ -196,7 +195,7 @@
     -h, --help  show this help message and exit
     --foo FOO   foo help
    $ cd ..
-   $ python subdir\myprogram.py --help
+   $ python subdir/myprogram.py --help
    usage: myprogram.py [-h] [--foo FOO]
 
    optional arguments: