diff --git a/en_US.ISO8859-1/books/handbook/security/chapter.sgml b/en_US.ISO8859-1/books/handbook/security/chapter.sgml
index 807870b165..f04f4c3ef6 100644
--- a/en_US.ISO8859-1/books/handbook/security/chapter.sgml
+++ b/en_US.ISO8859-1/books/handbook/security/chapter.sgml
@@ -1,7 +1,7 @@
 <!--
      The FreeBSD Documentation Project
 
-     $FreeBSD: doc/en_US.ISO_8859-1/books/handbook/security/chapter.sgml,v 1.36 2000/08/14 17:48:24 ben Exp $
+     $FreeBSD: doc/en_US.ISO_8859-1/books/handbook/security/chapter.sgml,v 1.37 2000/09/24 07:01:52 kris Exp $
 -->
 
 <chapter id="security">
@@ -2350,6 +2350,13 @@ FreeBSD BUILT-19950429 (GR386) #0: Sat Apr 29 17:50:09 SAT 1995</screen>
     <ulink url="http://www.kame.net/newsletter/">http://www.kame.net/newsletter/
     </ulink> has more comprehensive examples.</para>
 
+    <para>Please be aware that in order to use this functionality, you
+      must have the following options compiled into your kernel:</para>
+
+    <programlisting>
+options          IPSEC              #IP security
+options          IPSEC_ESP          #IP security (crypto; define w/IPSEC)</programlisting>
+
     <sect2>
       <title>Transport mode example with IPv4</title>
 
diff --git a/en_US.ISO_8859-1/books/handbook/security/chapter.sgml b/en_US.ISO_8859-1/books/handbook/security/chapter.sgml
index 807870b165..f04f4c3ef6 100644
--- a/en_US.ISO_8859-1/books/handbook/security/chapter.sgml
+++ b/en_US.ISO_8859-1/books/handbook/security/chapter.sgml
@@ -1,7 +1,7 @@
 <!--
      The FreeBSD Documentation Project
 
-     $FreeBSD: doc/en_US.ISO_8859-1/books/handbook/security/chapter.sgml,v 1.36 2000/08/14 17:48:24 ben Exp $
+     $FreeBSD: doc/en_US.ISO_8859-1/books/handbook/security/chapter.sgml,v 1.37 2000/09/24 07:01:52 kris Exp $
 -->
 
 <chapter id="security">
@@ -2350,6 +2350,13 @@ FreeBSD BUILT-19950429 (GR386) #0: Sat Apr 29 17:50:09 SAT 1995</screen>
     <ulink url="http://www.kame.net/newsletter/">http://www.kame.net/newsletter/
     </ulink> has more comprehensive examples.</para>
 
+    <para>Please be aware that in order to use this functionality, you
+      must have the following options compiled into your kernel:</para>
+
+    <programlisting>
+options          IPSEC              #IP security
+options          IPSEC_ESP          #IP security (crypto; define w/IPSEC)</programlisting>
+
     <sect2>
       <title>Transport mode example with IPv4</title>