diff --git a/bin/dig/dig.docbook b/bin/dig/dig.docbook
index 03c9fb66a3..22ba7f2ed1 100644
--- a/bin/dig/dig.docbook
+++ b/bin/dig/dig.docbook
@@ -275,9 +275,9 @@
 	<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>
@@ -338,11 +338,12 @@
 	<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
@@ -350,6 +351,12 @@
 	    record was
 	    <parameter>N</parameter>.
 	  </para>
+	  <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>
 
@@ -1055,7 +1062,7 @@
 	  <listitem>
 	    <para>
 	      This feature is now obsolete and has been removed;
-              use <command>delv</command> instead.
+	      use <command>delv</command> instead.
 	    </para>
 	  </listitem>
 	</varlistentry>
@@ -1151,8 +1158,8 @@
 	  <listitem>
 	    <para>
 	      This feature is related to <command>dig +sigchase</command>,
-              which is obsolete and has been removed. Use
-              <command>delv</command> instead.
+	      which is obsolete and has been removed. Use
+	      <command>delv</command> instead.
 	    </para>
 	  </listitem>
 	</varlistentry>
@@ -1197,9 +1204,9 @@
 	  <listitem>
 	    <para>
 	      Formerly specified trusted keys for use with
-              <command>dig +sigchase</command>.  This feature is now
-              obsolete and has been removed; use
-              <command>delv</command> instead.
+	      <command>dig +sigchase</command>.  This feature is now
+	      obsolete and has been removed; use
+	      <command>delv</command> instead.
 	    </para>
 	  </listitem>
 	</varlistentry>
@@ -1349,7 +1356,7 @@ 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>