diff --git a/Doc/library/os.path.rst b/Doc/library/os.path.rst
index ac24bf05c289b6..ecbbc1d7605f9f 100644
--- a/Doc/library/os.path.rst
+++ b/Doc/library/os.path.rst
@@ -81,7 +81,7 @@ the :mod:`glob` module.)
 
    Return the longest common sub-path of each pathname in the iterable
    *paths*.  Raise :exc:`ValueError` if *paths* contain both absolute
-   and relative pathnames, the *paths* are on the different drives or
+   and relative pathnames, if *paths* are on different drives, or
    if *paths* is empty.  Unlike :func:`commonprefix`, this returns a
    valid path.