update doc

README.md

@@ -75,14 +75,17 @@ Otherwise run the script with the parameter `start` instead of `test`.
 sudo ./ipv4-rules.sh start
 ```
 
-and create the following 2 cron jobs (via `crontab -e`):
+and create cron jobs (via `crontab -e`) like these:
 
 ```cron
 # DDoS prevention
 @reboot /root/ipv4-rules.sh start; /root/ipv6-rules.sh start
 
 # keep ips during reboot
 @hourly /root/ipv4-rules.sh save; /root/ipv6-rules.sh save
+
+# update Tor authorities
+@daily  /root/ipv4-rules.sh update; /root/ipv6-rules.sh update
 ```
 
 That's all.