diff --git a/xml/api/stonith_admin-2.33.rng b/xml/api/stonith_admin-2.33.rng
index f3fab68f9c..3cf63fb462 100644
--- a/xml/api/stonith_admin-2.33.rng
+++ b/xml/api/stonith_admin-2.33.rng
@@ -1,52 +1,55 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <grammar xmlns="http://relaxng.org/ns/structure/1.0"
          datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">
 
     <start>
         <ref name="element-stonith-admin"/>
     </start>
 
     <define name="element-stonith-admin">
         <choice>
             <ref name="stonith-admin-list" />
             <ref name="element-last-fenced" />
             <ref name="element-validation" />
             <element name="metadata"> <text /> </element>
         </choice>
     </define>
 
     <define name="stonith-admin-list">
         <optional>
             <element name="list">
                 <attribute name="name"> <text /> </attribute>
                 <attribute name="count"> <data type="nonNegativeInteger" /> </attribute>
                 <choice>
                     <empty/>
                     <oneOrMore>
                         <externalRef href="item-1.1.rng"/>
                     </oneOrMore>
                     <oneOrMore>
                         <externalRef href="fence-event-2.15.rng"/>
                     </oneOrMore>
                 </choice>
             </element>
         </optional>
     </define>
 
     <define name="element-last-fenced">
         <element name="last-fenced">
             <attribute name="target"> <text /> </attribute>
             <attribute name="when"> <text /> </attribute>
         </element>
     </define>
 
     <define name="element-validation">
         <element name="validate">
             <attribute name="agent"> <text /> </attribute>
             <attribute name="valid"> <data type="boolean" /> </attribute>
+            <optional>
+                <attribute name="device"> <text /> </attribute>
+            </optional>
             <optional>
                 <externalRef href="command-output-2.23.rng" />
             </optional>
         </element>
     </define>
 </grammar>