diff --git a/firewall.conf b/firewall.conf
index 7f16f34..f58fffa 100644
--- a/firewall.conf
+++ b/firewall.conf
@@ -40,6 +40,9 @@ TRAFFICS=()
 REDIRECTIONS=()
 
 ## Whitelist ssh
+# example with an external file
+# source /etc/firewall/whitelist_ssh
+# WHITELIST_SSH=(${WHITELIST_SSH[@]})
 # example : WHITELIST_SSH=("1.2.3.4" "1.3.4.4" "192.168.1.0/24")
 #WHITELIST_SSH=()