doc: add a word about Docker image version

The latest version may be broken from time to time.
vincentbernat · Aug 7, 2015 · d512056 · d512056
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diff --git a/README.md b/README.md
@@ -62,4 +62,7 @@ run this container like this:
 
     $ docker run -d -p 8080:8080 \
                  -v /var/lib/dashkiosk/database:/database \
-                 vincentbernat/dashkiosk
+                 vincentbernat/dashkiosk:latest
+
+Using `latest` can be broken from time to time. You may prefer a
+stable tag, like `2.6.1`.
diff --git a/docs/index.rst b/docs/index.rst
@@ -33,11 +33,12 @@ A live installation, reset every hour, is publicly available:
  - `administration panel`_
  - `receiver`_
 
-You can also quickly pull a ready-to-use version with Docker::
+You can also quickly pull a ready-to-use version with Docker (you may
+want to replace ``latest`` by a stable tag, like ``2.6.1``)::
 
     $ docker run -d -p 8080:8080 \
                  -v /var/lib/dashkiosk/database:/database \
-                 vincentbernat/dashkiosk
+                 vincentbernat/dashkiosk:latest
 
 Here is a demonstration video: