docker-install.md

@@ -25,6 +25,12 @@ To update:
 ## Deploying
 
 First make sure to create a production.yml file corresponding to your needs, see [the docker-compose docs](https://docs.docker.com/compose/).  
+
+Update the code:
+
+    $ git pull origin master
+
+
 Build:  
 
      $ docker-compose -f docker-compose.yml -f production.yml build --build-arg VERSION_DATE="$(git log -1 --format=%ad)"