diff --git a/language/predefined/iterator/key.xml b/language/predefined/iterator/key.xml
index 12f2e84870..69d1efc190 100644
--- a/language/predefined/iterator/key.xml
+++ b/language/predefined/iterator/key.xml
@@ -26,15 +26,14 @@
  <refsect1 role="returnvalues">
   &reftitle.returnvalues;
   <para>
-   Returns <type>scalar</type> on success, <type>integer</type>
-   <literal>0</literal> on failure.
+   Returns <type>scalar</type> on success, or &null; on failure.
   </para>
  </refsect1>
 
  <refsect1 role="errors"><!-- {{{ -->
   &reftitle.errors;
   <para>
-   Issues <constant>E_WARNING</constant> on failure.
+   Issues <constant>E_NOTICE</constant> on failure.
   </para>
  </refsect1><!-- }}} -->