diff --git a/includes/biblio.pages.inc b/includes/biblio.pages.inc
index ee335c4..ffd0185 100644
--- a/includes/biblio.pages.inc
+++ b/includes/biblio.pages.inc
@@ -313,6 +313,9 @@ function biblio_build_query($arg_list) {
   //add a tag of "node_access" to ensure that only nodes to which the user has access are retrieved
   $query->addTag('node_access');
 
+  // add tag so other modules may modify query
+  $query->addTag('biblio');
+
   $query->addField('n', 'nid');
   $type_name = $query->addField('bt', 'name', 'biblio_type_name');
   $query->leftJoin('biblio', 'b', 'n.vid=b.vid');
@@ -922,6 +925,7 @@ function biblio_search_query($keys) {
     $query->join('node', 'n', 'n.nid = i.sid');
     $query->condition('n.status', 1)
       ->addTag('node_access')
+      ->addTag('biblio')
       ->searchExpression($keys, 'node');
 
     // Insert special keywords.