diff --git a/bin/dnssec/dnssec-signzone.docbook b/bin/dnssec/dnssec-signzone.docbook
index 3d9ef761a3..e36559a2a9 100644
--- a/bin/dnssec/dnssec-signzone.docbook
+++ b/bin/dnssec/dnssec-signzone.docbook
@@ -18,7 +18,7 @@
  - PERFORMANCE OF THIS SOFTWARE.
 -->
 
-<!-- $Id: dnssec-signzone.docbook,v 1.41 2009/10/12 20:48:10 each Exp $ -->
+<!-- $Id: dnssec-signzone.docbook,v 1.42 2009/10/12 23:02:31 each Exp $ -->
 <refentry id="man.dnssec-signzone">
   <refentryinfo>
     <date>June 05, 2009</date>
@@ -558,7 +558,9 @@
         <listitem>
           <para>
             Only sign the DNSKEY RRset with key-signing keys, and omit
-            signatures from zone-signing keys.
+            signatures from zone-signing keys.  (This is similar to the
+            <command>dnskey-ksk-only yes;</command> zone option in
+            <command>named</command>.)
           </para>
         </listitem>
       </varlistentry>
@@ -569,7 +571,9 @@
           <para>
             Ignore KSK flag on key when determining what to sign.  This
             causes KSK-flagged keys to sign all records, not just the
-            DNSKEY RRset.
+            DNSKEY RRset.  (This is similar to the
+            <command>update-check-ksk no;</command> zone option in
+            <command>named</command>.)
           </para>
         </listitem>
       </varlistentry>
diff --git a/doc/arm/Bv9ARM-book.xml b/doc/arm/Bv9ARM-book.xml
index a6564ccbe9..4ce37a3b73 100644
--- a/doc/arm/Bv9ARM-book.xml
+++ b/doc/arm/Bv9ARM-book.xml
@@ -18,7 +18,7 @@
  - PERFORMANCE OF THIS SOFTWARE.
 -->
 
-<!-- File: $Id: Bv9ARM-book.xml,v 1.434 2009/10/12 22:54:54 each Exp $ -->
+<!-- File: $Id: Bv9ARM-book.xml,v 1.435 2009/10/12 23:02:32 each Exp $ -->
 <book xmlns:xi="http://www.w3.org/2001/XInclude">
   <title>BIND 9 Administrator Reference Manual</title>
 
@@ -6459,7 +6459,9 @@ options {
                   used to sign the DNSKEY RRset at the zone apex.
                   However, if this option is set to <literal>no</literal>,
                   then the KSK bit is ignored; KSKs are treated as if they
-                  were ZSKs and are used to sign the entire zone.
+                  were ZSKs and are used to sign the entire zone.  This is
+                  similar to the <command>dnssec-signzone -z</command>
+                  command line option.
 		</para>
 		<para>
                   When this option is set to <literal>yes</literal>, there
@@ -6482,6 +6484,10 @@ options {
                   to sign the DNSKEY RRset at the zone apex.  Zone-signing
                   keys (keys without the KSK bit set) will be used to sign
                   the remainder of the zone, but not the DNSKEY RRset.
+                  This is similar to the
+                  <command>dnssec-signzone -x</command> command line option.
+		</para>
+		<para>
 		  The default is <command>no</command>.  If
                   <command>update-check-ksk</command> is set to
                   <literal>no</literal>, this option is ignored.