From 006617ff7d6df3fdedcfe53e94ee2c52cc796437 Mon Sep 17 00:00:00 2001
From: Ivan Chernoff <chernoffivan@gmail.com>
Date: Tue, 29 Aug 2017 17:46:24 +0300
Subject: [PATCH] bpo-31065: Add doc about Popen.poll returning None. (#3169)

---
 Doc/library/subprocess.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Doc/library/subprocess.rst b/Doc/library/subprocess.rst
index 2eaa48e070..a4e234e62a 100644
--- a/Doc/library/subprocess.rst
+++ b/Doc/library/subprocess.rst
@@ -584,7 +584,7 @@ Instances of the :class:`Popen` class have the following methods:
 .. method:: Popen.poll()
 
    Check if child process has terminated.  Set and return
-   :attr:`~Popen.returncode` attribute.
+   :attr:`~Popen.returncode` attribute. Otherwise, returns ``None``.
 
 
 .. method:: Popen.wait(timeout=None)
-- 
2.40.0