diff --git a/mapfile/template.j2 b/mapfile/template.j2
index 5d0f5436593e7d061161c3b0612187b17fcf534b..14f1a7916190edf9922ee9bfee58cfe297595e87 100644
--- a/mapfile/template.j2
+++ b/mapfile/template.j2
@@ -77,7 +77,7 @@ WEB
               
               <h3>Explanation of parameters</h3>
               <ul>
-              <li>WHS = Wet hour sum</li>
+              <li>WHS = <span itemprop=\"WHS\">Wet hour sum</span></li>
               </ul>
             </div>
             "