diff --git a/docs/traffic_shaping.xml b/docs/traffic_shaping.xml
index c146c2d98..a16d2d6e8 100644
--- a/docs/traffic_shaping.xml
+++ b/docs/traffic_shaping.xml
@@ -539,6 +539,23 @@ ppp0           6000kbit         500kbit</programlisting>
             mark's value is tested.</member>
           </simplelist>
         </listitem>
+
+        <listitem>
+          <para>LENGTH (Optional, Added in Shorewall version 3.2.0) Packet
+          Length - This field, if present, allows you to match the length of a
+          packet against a specific value or range of values. A range is
+          specified in the form &lt;min&gt;:&lt;max&gt; where either
+          &lt;min&gt; or &lt;max&gt; (but not both may be omitted). If
+          &lt;min&gt; is omitted, then 0 is assumed; if &lt;max&gt; is
+          omitted, than any packet that is &lt;min&gt; or longer will
+          match.</para>
+
+          <para>You must have iptables length support for this to work. If you
+          let it empy or place an "-" here, no length match will be
+          done.</para>
+
+          <para>Examples: 1024, 64:1500, :100</para>
+        </listitem>
       </itemizedlist>
 
       <example>