diff --git a/NetBiblio.php b/NetBiblio.php
index e59018f..90f0f8e 100644
--- a/NetBiblio.php
+++ b/NetBiblio.php
@@ -661,8 +661,8 @@ class NetBiblio extends WebService
             $bs->addQuery(1, 'jeunesse');
         }
 
-        $queries = array('producerCode', 'reader');
-        foreach($queries as $q) {
+        $availableFields = array('producerCode', 'author', 'reader', 'motsMatieres');
+        foreach($availableFields as $q) {
             if(isset($queryArray[$q]) && strlen($queryArray[$q]) > 0) {
                 $bs->addQuery($queryArray[$q], $q);
             }