Update README.md

diff --git a/README.md b/README.md
index 6d2610856afa8a659f48047a5699d9ece8e9289a..c54ebfa1dba6fabbda55e76d8ae03bf3cac571c2 100644 (file)
--- a/README.md
+++ b/README.md
@@ -101,7 +101,8 @@ If you are updating an existing installation of `nqptp`, after installing it you
 ## Firewall
 If your system runs a firewall, ensure that ports 319 and 320 are open for UDP traffic in both directions. These ports are associated with PTP service and may be referred to as "PTP" in firewall rules. For example, the following would open ports 319 and 320 for Fedora, which uses `firewalld`:
 ```
-# firewall-cmd --permanent --add-service=ptp
+# firewall-cmd --add-service=ptp
+# firewall-cmd --permanent --add-service=ptp # make it permanent across reboots
 ```