diff --git a/en_US.ISO8859-1/books/handbook/security/chapter.sgml b/en_US.ISO8859-1/books/handbook/security/chapter.sgml
index 8af1c416e9..4feb590264 100644
--- a/en_US.ISO8859-1/books/handbook/security/chapter.sgml
+++ b/en_US.ISO8859-1/books/handbook/security/chapter.sgml
@@ -66,7 +66,8 @@
       </listitem>
 
       <listitem>
-	<para>How to create firewalls using <acronym>IPFW</acronym>.</para>
+	<para>How to create firewalls using <acronym>PF</acronym>,
+	  IPFILTER (IPF) or <acronym>IPFW</acronym>.</para>
       </listitem>
 
       <listitem>