From 4715b2b12ceede6b8b40e5a336a546435a7315dd Mon Sep 17 00:00:00 2001
From: Brad Warren <bmw@eff.org>
Date: Thu, 10 Aug 2017 14:18:27 -0700
Subject: [PATCH] Further document check_output

---
 certbot-postfix/certbot_postfix/util.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/certbot-postfix/certbot_postfix/util.py b/certbot-postfix/certbot_postfix/util.py
index 8ad6408c4..d7145b7c8 100644
--- a/certbot-postfix/certbot_postfix/util.py
+++ b/certbot-postfix/certbot_postfix/util.py
@@ -27,6 +27,9 @@ def check_output(*args, **kwargs):
     :returns: data printed to stdout
     :rtype: str
 
+    :raises ValueError: if arguments are invalid
+    :raises subprocess.CalledProcessError: if the command fails
+
     """
     for keyword in ('stdout', 'universal_newlines',):
         if keyword in kwargs: