diff -r d5536c06a082 Doc/library/os.path.rst
--- a/Doc/library/os.path.rst	Fri Jul 05 01:40:52 2013 +0200
+++ b/Doc/library/os.path.rst	Thu Jul 11 19:47:44 2013 +0200
@@ -234,7 +234,8 @@
 .. function:: relpath(path, start=None)
 
    Return a relative filepath to *path* either from the current directory or from
-   an optional *start* point.
+   an optional *start* directory.  Note that the filesystem is not accessed to
+   confirm that *path* or *start* exists.
 
    *start* defaults to :attr:`os.curdir`.