diff --git a/reference/array/constants.xml b/reference/array/constants.xml
new file mode 100644
index 0000000000..3443f4ee5b
--- /dev/null
+++ b/reference/array/constants.xml
@@ -0,0 +1,57 @@
+<?xml version="1.0" encoding="iso-8859-1"?>
+<!-- $Revision $ -->
+<section id="array.constants">
+ &reftitle.constants;
+ &extension.constants;
+ <variablelist>
+  <varlistentry>
+   <term>
+    <constant>CASE_LOWER</constant>
+    (<link linkend="language.types.integer">integer</link>)
+   </term>
+   <listitem>
+    <simpara>
+     <constant>CASE_LOWER</constant> is used with
+     <function>array_change_key_case</function> and is used to convert array
+     keys to lower case. This is also the default case for
+     <function>array_change_key_case</function>.
+    </simpara>
+   </listitem>
+  </varlistentry>
+  <varlistentry>
+   <term>
+    <constant>CASE_UPPER</constant>
+    (<link linkend="language.types.integer">integer</link>)
+   </term>
+   <listitem>
+    <simpara>
+     <constant>CASE_UPPER</constant> is used with
+     <function>array_change_key_case</function> and is used to convert array
+     keys to upper case.
+    </simpara>
+   </listitem>
+  </varlistentry>
+ </variablelist>
+</section>
+
+<!-- Keep this comment at the end of the file
+Local variables:
+mode: sgml
+sgml-omittag:t
+sgml-shorttag:t
+sgml-minimize-attributes:nil
+sgml-always-quote-attributes:t
+sgml-indent-step:1
+sgml-indent-data:t
+indent-tabs-mode:nil
+sgml-parent-document:nil
+sgml-default-dtd-file:"../../../manual.ced"
+sgml-exposed-tags:nil
+sgml-local-catalogs:nil
+sgml-local-ecat-files:nil
+End:
+vim600: syn=xml fen fdm=syntax fdl=2 si
+vim: et tw=78 syn=sgml
+vi: ts=1 sw=1
+-->
+
diff --git a/reference/array/reference.xml b/reference/array/reference.xml
index 9ae3fec330..97b6d8c8ee 100644
--- a/reference/array/reference.xml
+++ b/reference/array/reference.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.5 $ -->
+<!-- $Revision: 1.6 $ -->
  <reference id="ref.array">
   <title>Array Functions</title>
   <titleabbrev>Arrays</titleabbrev>
@@ -45,14 +45,7 @@
     &no.resource;
    </section>
 
-   <section id="array.constants">
-    &reftitle.constants;
-    <para>
-     <constant>CASE_UPPER</constant> and <constant>CASE_LOWER</constant> are
-     used with the <function>array_change_key_case</function> function. They
-     respectively are used for changing a string to upper case or lower case.
-    </para>
-   </section>
+   &reference.array.constants;
 
    <section id="array.seealso">
     &reftitle.seealso;