diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index d29c20e6ed..f4af65f13f 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -2878,6 +2878,9 @@
   <disk type='block' device='lun'>
     <driver name='qemu' type='raw'/>
     <source dev='/dev/sda'>
+      <slices>
+        <slice type='storage' offset='12345' size='123'/>
+      </slices>
       <reservations managed='no'>
         <source type='unix' path='/path/to/qemu-pr-helper' mode='client'/>
       </reservations>
@@ -3360,6 +3363,16 @@
             controller.
             <span class="since">Since 6.0.0</span>
           </dd>
+          <dt><code>slices</code></dt>
+          <dd>The <code>slices</code> element using its <code>slice</code>
+            sub-elements allows configuring offset and size of either the
+            location of the image format (<code>slice type='storage'</code>)
+            inside the storage source or the guest data inside the image format
+            container (future expansion).
+
+            The <code>offset</code> and <code>size</code> values are in bytes.
+            <span class="since">Since 6.1.0</span>
+          </dd>
         </dl>
 
         <p>
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index 29b6b95357..4be751461d 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -1596,12 +1596,31 @@
     </optional>
   </define>
 
+  <define name="diskSourceSlice">
+    <attribute name='offset'>
+      <ref name="positiveInteger"/>
+    </attribute>
+    <attribute name='size'>
+      <ref name="positiveInteger"/>
+    </attribute>
+  </define>
+
   <define name="diskSourceCommon">
     <optional>
       <attribute name="index">
         <ref name="positiveInteger"/>
       </attribute>
     </optional>
+    <optional>
+      <element name='slices'>
+        <element name='slice'>
+          <attribute name='type'>
+            <value>storage</value>
+          </attribute>
+          <ref name="diskSourceSlice"/>
+        </element>
+      </element>
+    </optional>
   </define>
 
   <define name="diskSource">