Add rippled auto-update instructions

content/tutorial-rippled-setup.md

@@ -108,8 +108,33 @@ It can take several minutes for `rippled` to sync with the rest of the network,
 
 ## Updating rippled ##
 
+### Automatic ###
+
+Automatic rippled updates can be enabled with a one-time Cron configuration:
+
+1. Check that `/opt/ripple/bin/update-rippled.sh` exists. If it does not, perform a [manual update](#manual).
+
+2. Install `crond`:
+
+        $ sudo yum install cronie
+
+3. Open the crontab file for editing
+
+        $ sudo crontab -e
+
+4. Add the following to the crontab file. Be sure to add a blank line at the end of the file.
+
+        RANDOM_DELAY=59
+        0 * * * * /opt/ripple/bin/update-rippled.sh
+
+
+The installed `rippled` package will be updated within an hour of a new release.
+
+### Manual ###
+
 Run the following commands to update to the latest release of `rippled`:
 
+        $ sudo rpm -Uvh --replacepkgs https://mirrors.ripple.com/ripple-repo-el7.rpm
         $ sudo yum update --enablerepo=ripple-stable rippled
         $ sudo systemctl daemon-reload
         $ sudo service rippled restart
@@ -130,7 +155,7 @@ Running a `rippled` validator that participates in the Consensus process is simp
 
 ## Validator Setup ##
 
-1. [Install and configure a `rippled` server.](#installing-rippled)
+1. [Install a `rippled` server.](#installing-rippled)
 
 2. Start `rippled`: