Clarify fd inheritance when close_fds=False. (GH-6240)
Clarify the subprocess documentation.
diff --git a/Doc/library/subprocess.rst b/Doc/library/subprocess.rst
index db7a88a..fbf2c3d 100644
--- a/Doc/library/subprocess.rst
+++ b/Doc/library/subprocess.rst
@@ -459,7 +459,10 @@
common use of *preexec_fn* to call os.setsid() in the child.
If *close_fds* is true, all file descriptors except :const:`0`, :const:`1` and
- :const:`2` will be closed before the child process is executed.
+ :const:`2` will be closed before the child process is executed. Otherwise
+ when *close_fds* is false, file descriptors obey their inheritable flag
+ as described in :ref:`fd_inheritance`.
+
On Windows, if *close_fds* is true then no handles will be inherited by the
child process unless explicitly passed in the ``handle_list`` element of
:attr:`STARTUPINFO.lpAttributeList`, or by standard handle redirection.