custom server backup_dir

Change-Id: I6295b7e241c83935deccd4e930ed806ef92fde5b
diff --git a/README.rst b/README.rst
index b73a1ad..f539168 100644
--- a/README.rst
+++ b/README.rst
@@ -29,6 +29,7 @@
           hours_before_full: 24
           target:
             host: cfg01
+            home_dir: server-home-dir
 
   .. note:: full_backups_to_keep param states how many backup will be stored locally on cassandra client.
             More options to relocate local backups can be done using salt-formula-backupninja.