diff --git a/main/inc/lib/extra_field_value.lib.php b/main/inc/lib/extra_field_value.lib.php
index 0206e7b132..972b66ed9d 100755
--- a/main/inc/lib/extra_field_value.lib.php
+++ b/main/inc/lib/extra_field_value.lib.php
@@ -963,6 +963,7 @@ class ExtraFieldValue extends Model
     }
 
     /**
+     * Return extra fields details for an item if the extra field is marked as filter.
      * @param int $itemId
      *
      * @return array