diff --git a/Lib/Search/BookSearch.php b/Lib/Search/BookSearch.php
index e173431..55b5756 100644
--- a/Lib/Search/BookSearch.php
+++ b/Lib/Search/BookSearch.php
@@ -35,6 +35,15 @@ class BookSearch
         $this->query->addParam('q.op', 'AND');
     }
 
+    public function addOrQuery(array $texts, $field)
+    {
+        if(count($texts) > 0) {
+            $texts = array_map(array('SolrUtils', 'escapeQueryChars'), $texts);
+            $query = sprintf('%s:(%s)', $field, implode(' OR ', $texts));
+            $this->addQuery($query, null, false);
+        }
+    }
+
     public function addQuery($queryText, $queryField = null, $escape = true)
     {
         if($escape) {
@@ -115,8 +124,7 @@ class BookSearch
         }
 
         $bs = new static();
-        $query = sprintf('%s:(%s)', $field, implode(' OR ', $codes));
-        $bs->addQuery($query, null, false);
+        $bs->addOrQuery($codes, $field);
         $results = $bs->getResults(0, $count);
         return $results['books'];
     }
diff --git a/NetBiblio.php b/NetBiblio.php
index f93af8d..3070350 100644
--- a/NetBiblio.php
+++ b/NetBiblio.php
@@ -540,7 +540,23 @@ class NetBiblio extends WebService
      * This method is used by the website and the Android application to perform
      * book search.
      *
-     * TODO: describe various options for the parameters
+     * Search parameters :
+     *
+     * ° queryText : the text to search for
+     * ° queryType : the field to search in, defaults to 'text'
+     *
+     * ° genre : array of 'genreCode' to search for
+     * ° jeunesse : only display books for kids (must have format 'jeunesse' => array('filtrer' => 'filtrer')
+     * ° producerCode : filter by 'producerCode'
+     * ° reader : filter by 'reader'
+     *
+     * ° count : number of results we want
+     * ° page : page to start at (0 is the first)
+     *
+     * Deprecated, but still in use on mobile apps :
+     *
+     * ° category : synonym for 'genre' (see above)
+     * ° producer : synonym for 'producerCode' (see above)
      *
      * @param string $values JSON encoded object
      * @return array
@@ -555,10 +571,16 @@ class NetBiblio extends WebService
             throw new WebException("CallArg", "Argument must be valid JSON.", -42);
         }
 
-        // The iOS and Android applications still uses 'category' instead of 'genre'
-        if(isset($queryArray['category']) && is_array($queryArray['category'])) {
-            $queryArray['genre'] = $queryArray['category'];
-            unset($queryArray['category']);
+        // The iOS and Android applications still uses 'category' and 'producer'
+        $compatibility = array(
+            'category' => 'genre',
+            'producer' => 'producerCode'
+        );
+        foreach($compatibility as $old => $new) {
+            if(isset($queryArray[$old])) {
+                $queryArray[$new] = $queryArray[$old];
+                unset($queryArray[$old]);
+            }
         }
 
         $bs = new BookSearch();
@@ -589,21 +611,18 @@ class NetBiblio extends WebService
             $selectedGenres = array_filter($queryArray['genre'], function ($c) {
                 return $c != '0';
             });
-            if (count($selectedGenres) > 0) {
-                $selectedGenres = array_map(function ($c) {
-                    return 'genreCode:'.\SolrUtils::escapeQueryChars($c);
-                }, $selectedGenres);
-                $bs->addQuery('('.implode(' OR ', $selectedGenres).')', null, false);
-            }
+            $bs->addOrQuery($selectedGenres, 'genreCode');
         }
 
         if(isset($queryArray['jeunesse']) && $queryArray['jeunesse']['filtrer'] === 'filtrer') {
             $bs->addQuery(1, 'jeunesse');
         }
 
-        // The following query filter is used by the mobile applications
-        if(isset($queryArray['producer']) && strlen($queryArray['producer']) > 0) {
-            $bs->addQuery($queryArray['producer'], 'producerCode');
+        $queries = array('producerCode', 'reader');
+        foreach($queries as $q) {
+            if(isset($queryArray[$q]) && strlen($queryArray[$q]) > 0) {
+                $bs->addQuery($queryArray[$q], $q);
+            }
         }
 
         $count = isset($queryArray['count']) ? (int) $queryArray['count'] : Configuration::get('solr.result_count');