diff --git a/reference/mysqli/mysqli/connect-error.xml b/reference/mysqli/mysqli/connect-error.xml
index a3f94efcba..84962f67b4 100644
--- a/reference/mysqli/mysqli/connect-error.xml
+++ b/reference/mysqli/mysqli/connect-error.xml
@@ -26,7 +26,7 @@
  <refsect1 role="returnvalues">
   &reftitle.returnvalues;
   <para>
-   A string that describes the error. An empty string if no error occurred.
+   A string that describes the error. <literal>NULL</literal> is returned if no error occurred.
   </para>
  </refsect1>