diff --git a/bin/dig/dig.docbook b/bin/dig/dig.docbook
index 4e551b75e3..8e6c31a278 100644
--- a/bin/dig/dig.docbook
+++ b/bin/dig/dig.docbook
@@ -280,9 +280,9 @@
         <term>-i</term>
         <listitem>
 	  <para>
-	    Do reverse IPv6 lookups using the obsolete RFC1886 IP6.INT
+	    Do reverse IPv6 lookups using the obsolete RFC 1886 IP6.INT
 	    domain, which is no longer in use. Obsolete bit string
-	    label queries (RFC2874) are not attempted.
+	    label queries (RFC 2874) are not attempted.
 	  </para>
         </listitem>
       </varlistentry>
@@ -343,19 +343,25 @@
         <term>-t <replaceable class="parameter">type</replaceable></term>
         <listitem>
 	  <para>
-	    The resource record type to query. It can be any valid query type
-	    which is
-	    supported in BIND 9.  The default query type is "A", unless the
-	    <option>-x</option> option is supplied to indicate a reverse lookup.
-	    A zone transfer can be requested by specifying a type of AXFR.  When
+	    The resource record type to query. It can be any valid query
+	    type.  If it is a resource record type supported in BIND 9, it
+	    can be given by the type mnemonic (such as "NS" or "AAAA").
+	    The default query type is "A", unless the <option>-x</option>
+	    option is supplied to indicate a reverse lookup.  A zone
+	    transfer can be requested by specifying a type of AXFR.  When
 	    an incremental zone transfer (IXFR) is required, set the
 	    <parameter>type</parameter> to <literal>ixfr=N</literal>.
 	    The incremental zone transfer will contain the changes
 	    made to the zone since the serial number in the zone's SOA
-	    record was
-	    <parameter>N</parameter>.
+	    record was <parameter>N</parameter>.
 	  </para>
-        </listitem>
+	  <para>
+	    All resource record types can be expressed as "TYPEnn", where
+	    "nn" is the number of the type. If the resource record type is
+	    not supported in BIND 9, the result will be displayed as
+	    described in RFC 3597.
+	  </para>
+	</listitem>
       </varlistentry>
 
       <varlistentry>
@@ -1254,7 +1260,7 @@ dig +qr www.isc.org any -x 127.0.0.1 isc.org ns +noqr
       <citerefentry>
 	<refentrytitle>dnssec-keygen</refentrytitle><manvolnum>8</manvolnum>
       </citerefentry>,
-      <citetitle>RFC1035</citetitle>.
+      <citetitle>RFC 1035</citetitle>.
     </para>
   </refsection>