diff --git a/xsd/c3d2web.xsd b/xsd/c3d2web.xsd
index 115898b2f..b39508d0f 100644
--- a/xsd/c3d2web.xsd
+++ b/xsd/c3d2web.xsd
@@ -103,6 +103,7 @@
     <xs:choice>
       <xs:element ref="link"/>
       <xs:element ref="em"/>
+      <xs:element ref="strong"/>
       <xs:element ref="image"/>
     </xs:choice>
   </xs:group>