diff --git a/module/VuFind/src/VuFind/OAI/Server.php b/module/VuFind/src/VuFind/OAI/Server.php
index 0c012af7d2d..98c367a6050 100644
--- a/module/VuFind/src/VuFind/OAI/Server.php
+++ b/module/VuFind/src/VuFind/OAI/Server.php
@@ -379,7 +379,7 @@ protected function attachRecordHeader(
      *
      * @param object $record A record driver object
      *
-     * @return string
+     * @return string|false String on success and false if an error occurred
      */
     protected function getVuFindMetadata($record)
     {