Add reference to domain

Orangepi-setup.md

@@ -138,6 +138,7 @@ In non-root users, I have experienced a lot of "Killed" errors when running prog
 
 # Duck DNS
 *I am following (and elaborating on) these instructions: https://www.duckdns.org/install.jsp*
+*I setup the Orange Pi as ppl1.duckdns.org*
 
 You can run ran `ps -ef | grep cr[o]n` to check and see if cron is installed, it is installed by default in Raspbian.