diff --git a/vitruvio-form-widgets.xsd b/vitruvio-form-widgets.xsd
index b79f980..fe93ded 100644
--- a/vitruvio-form-widgets.xsd
+++ b/vitruvio-form-widgets.xsd
@@ -30,6 +30,7 @@
 	<xs:attribute name="caption-field" type="xs:string" use="required"/>
 	<xs:attribute name="start-date-field" type="xs:string" use="required"/>
 	<xs:attribute name="end-date-field" type="xs:string" use="required"/>
+    <xs:attribute name="style-name-field" type="xs:string" use="optional"/>
 	<xs:attribute name="description-field" type="xs:string" use="optional"/>
 	<xs:attributeGroup ref="datasource-basic-attrs" />
 </xs:complexType>