Add instructions to fetch the latest image

README.md

@@ -353,8 +353,10 @@ Check what version of weave you are running:
 
     weave version
 
-and compare against https://registry.hub.docker.com/u/zettio/weave/tags/manage/
-to ensure you have the latest released version.
+and compare against https://registry.hub.docker.com/u/zettio/weave/tags/manage/.
+If you don't have the latest released version you can download it with:
+
+    docker pull zettio/weave
 
 Check the weave container logs with