From 3fc974f2d4d3d8f0c5ae54f3a347422b50a1c560 Mon Sep 17 00:00:00 2001
From: Georg Brandl <georg@python.org>
Date: Sun, 11 May 2008 21:16:37 +0000
Subject: [PATCH] Clarify os.strerror()s exception behavior.

---
 Doc/library/os.rst | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Doc/library/os.rst b/Doc/library/os.rst
index 0790f644d87..b2d8f808573 100644
--- a/Doc/library/os.rst
+++ b/Doc/library/os.rst
@@ -285,7 +285,8 @@ process and user.
 .. function:: strerror(code)
 
    Return the error message corresponding to the error code in *code*.
-   Availability: Unix, Windows.
+   On platforms where :cfunc:`strerror` returns ``NULL`` when given an unknown
+   error number, :exc:`ValueError` is raised.  Availability: Unix, Windows.
 
 
 .. function:: umask(mask)