diff --git a/petrified.conf b/petrified.conf
index a54c907..45b450b 100644
--- a/petrified.conf
+++ b/petrified.conf
@@ -7,8 +7,11 @@
 #
 # Passing '-c <config>' on the commandline will read *only* the named
 # config file, ignoring /etc/petrified.conf and ~/.petrifiedrc entirely.
+# For best security of the DDNS_KEY, ensure the config file is mode 0600
+# and owned by the user in question.
 #
-# See petrified.crontab for examples on how to run via cron.
+# See petrified.crontab for examples on how to run via cron/fcron.
+
 
 # This is the unique string for the dynamic DNS entry to update; visit
 # http://freedns.afraid.org/dynamic/ - next to the DNS entries towards