diff --git a/framework/xsd/xml-screen-3.xsd b/framework/xsd/xml-screen-3.xsd
index d874687d8..3965e6808 100644
--- a/framework/xsd/xml-screen-3.xsd
+++ b/framework/xsd/xml-screen-3.xsd
@@ -669,6 +669,7 @@ along with this software (see the LICENSE.md file). If not, see
             <xs:enumeration value="code"/><xs:enumeration value="pre"/>
             <xs:enumeration value="hr"/><xs:enumeration value="i"/>
         </xs:restriction></xs:simpleType></xs:attribute>
+        <xs:attribute name="condition" type="xs:string"/>
     </xs:complexType></xs:element>
 
     <xs:element name="container-box" substitutionGroup="AllWidgets"><xs:complexType>