diff --git a/reference/filesystem/functions/is-dir.xml b/reference/filesystem/functions/is-dir.xml
index 6e44640a98..8af3c26c6c 100644
--- a/reference/filesystem/functions/is-dir.xml
+++ b/reference/filesystem/functions/is-dir.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.3 $ -->
+<!-- $Revision: 1.4 $ -->
 <!-- splitted from ./en/functions/filesystem.xml, last change in rev 1.2 -->
   <refentry id="function.is-dir">
    <refnamediv>
@@ -27,7 +27,8 @@
      be examined must be accessible via the server's filesystem.
     </simpara>
     <para>
-     See also <function>chdir</function>, <function>is_file</function> and
+     See also <function>chdir</function>, <function>dir</function>,
+     <function>opendir</function>, <function>is_file</function> and
      <function>is_link</function>.
     </para>
    </refsect1>