diff --git a/public/xmlns/tract.xsd b/public/xmlns/tract.xsd
index ef1835cf8..bd1695b4d 100644
--- a/public/xmlns/tract.xsd
+++ b/public/xmlns/tract.xsd
@@ -188,6 +188,7 @@
                     text-scale: DEFAULT( 1.0 )
             -->
             <xs:choice minOccurs="0" maxOccurs="unbounded">
+                <xs:element ref="content:spacer" />
                 <xs:element ref="content:paragraph" />
                 <xs:element ref="content:form" />
             </xs:choice>