diff --git a/en_US.ISO8859-1/books/handbook/firewalls/chapter.xml b/en_US.ISO8859-1/books/handbook/firewalls/chapter.xml
index c60472927d..b2c80dda4d 100644
--- a/en_US.ISO8859-1/books/handbook/firewalls/chapter.xml
+++ b/en_US.ISO8859-1/books/handbook/firewalls/chapter.xml
@@ -2906,6 +2906,7 @@ options IPFILTER_DEFAULT_BLOCK</programlisting>
 
       <programlisting>ipfilter_enable="YES"             # Start ipf firewall
 ipfilter_rules="/etc/ipf.rules"   # loads rules definition text file
+ipv6_ipfilter_rules="/etc/ipf6.rules" # loads rules definition text file for IPv6
 ipmon_enable="YES"                # Start IP monitor log
 ipmon_flags="-Ds"                 # D = start as daemon
                                   # s = log to syslog