diff --git a/reference/dom/domdocument/xinclude.xml b/reference/dom/domdocument/xinclude.xml
index 859b915999..ee7c9273a6 100644
--- a/reference/dom/domdocument/xinclude.xml
+++ b/reference/dom/domdocument/xinclude.xml
@@ -43,7 +43,8 @@
  <refsect1 role="returnvalues">
   &reftitle.returnvalues;
   <para>
-   Returns the number of XIncludes in the document or -1 if some processing failed.
+   Returns the number of XIncludes in the document, -1 if some processing failed,
+   or &false; if there were no substitutions.
   </para>
  </refsect1>
  <refsect1 role="examples">