From 67c0b3d89c4da9750fdb43fc66d3924681b22d2e Mon Sep 17 00:00:00 2001
From: Zackery Spytz <zspytz@gmail.com>
Date: Mon, 12 Apr 2021 09:39:31 -0600
Subject: bpo-41661: Document os.path.relpath() exception on Windows with
 different drives (GH-25346)

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

diff --git a/Doc/library/os.path.rst b/Doc/library/os.path.rst
index e2f335e..4cab311 100644
--- a/Doc/library/os.path.rst
+++ b/Doc/library/os.path.rst
@@ -366,7 +366,8 @@ the :mod:`glob` module.)
    Return a relative filepath to *path* either from the current directory or
    from an optional *start* directory.  This is a path computation:  the
    filesystem is not accessed to confirm the existence or nature of *path* or
-   *start*.
+   *start*.  On Windows, :exc:`ValueError` is raised when *path* and *start*
+   are on different drives.
 
    *start* defaults to :attr:`os.curdir`.
 
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