doc/backup-and-restore.md

@@ -4,9 +4,9 @@ We're using [Ark][1] for backing up Kubernetes config and GKE resources. It is
 available as a Git submodule in the `vendor/` folder (incl. the `ark`
 executable).
 
-In order to initialize submodules in your local repo, run once:
+In order to initialize and update submodules in your local repo, run once:
 
-    git submodule init
+    git submodule update --init
 
 Then, to fetch/update the modules, run: