diff --git a/docs/formatnetwork.html.in b/docs/formatnetwork.html.in
index f26909bec8..f5a48d9b92 100644
--- a/docs/formatnetwork.html.in
+++ b/docs/formatnetwork.html.in
@@ -930,8 +930,12 @@
 </dns>
 <ip address="192.168.122.1" netmask="255.255.255.0" localPtr="yes">
   <dhcp>
-    <range start="192.168.122.100" end="192.168.122.254"/>
-    <host mac="00:16:3e:77:e2:ed" name="foo.example.com" ip="192.168.122.10"/>
+    <range start="192.168.122.100" end="192.168.122.254">
+      <lease expiry='1' unit='hours'/>
+    </range>
+    <host mac="00:16:3e:77:e2:ed" name="foo.example.com" ip="192.168.122.10">
+      <lease expiry='30' unit='minutes'/>
+    </host>
     <host mac="00:16:3e:3e:a9:1a" name="bar.example.com" ip="192.168.122.11"/>
   </dhcp>
 </ip>
@@ -1130,6 +1134,19 @@
                 <span class="since">since 0.7.3</span>)
               </dd>
             </dl>
+
+            <p>
+              Optionally, <code>range</code> and <code>host</code> elements can
+              have <code>lease</code> child element which specifies the lease
+              time through it's attributes <code>expiry</code> and
+              <code>unit</code> (which accepts <code>seconds</code>,
+              <code>minutes</code> and <code>hours</code> and defaults to
+              <code>minutes</code> if omitted). The minimal lease time is 2
+              minutes, except when setting an infinite lease time
+              (<code>expiry='0'</code>).
+              <span class="since">Since 6.3.0</span>
+            </p>
+
           </dd>
         </dl>
       </dd>