From 9cde36e51fb94efaeb1846806610d6af4eeb996d Mon Sep 17 00:00:00 2001
From: Wojciech Kozlowski <wk@wojciechkozlowski.eu>
Date: Mon, 10 Dec 2018 08:17:52 +0000
Subject: [PATCH] Update README

---
 README.rst | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/README.rst b/README.rst
index bd8337c..d51d9e6 100644
--- a/README.rst
+++ b/README.rst
@@ -49,8 +49,13 @@ Updating
 
 To update the images and restart run
 
-``WARNING: THIS WILL REMOVE ALL UNUSED DOCKER IMAGES``
+``WARNING: THIS WILL REMOVE ALL DANGLING DOCKER IMAGES``
 
 ::
 
    ./update.sh
+
+A dangling image is one that does not have a tag, i.e., it is listed with a
+``<none>`` tag. The update pulls new versions of the images being used so all
+old images will now be left untagged and thus removed. However, if you have
+other untagged images, this will remove them as well.