diff --git a/Doc/library/os.rst b/Doc/library/os.rst
index d2534b3e974f36..fc97558f3c4f00 100644
--- a/Doc/library/os.rst
+++ b/Doc/library/os.rst
@@ -3901,6 +3901,8 @@ features:
    as a directory if *target_is_directory* is ``True`` or a file symlink (the
    default) otherwise.  On non-Windows platforms, *target_is_directory* is ignored.
 
+   If the *dst* already exists, :exc:`FileExistsError` is raised.
+
    This function can support :ref:`paths relative to directory descriptors
    <dir_fd>`.