diff --git a/reference/calendar/reference.xml b/reference/calendar/reference.xml
index 46d98a9acc..fc9e81599f 100644
--- a/reference/calendar/reference.xml
+++ b/reference/calendar/reference.xml
@@ -1,11 +1,11 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.2 $ -->
+<!-- $Revision: 1.3 $ -->
  <reference id="ref.calendar">
   <title>Calendar functions</title>
   <titleabbrev>Calendar</titleabbrev>
   <partintro>
-   <section>
-    <title>Introduction</title>
+   <section id="calendar.intro">
+    &reftitle.intro;
     <para>
      The calendar extension presents a series of functions to simplify
      converting between different calendar formats.  The intermediary
@@ -21,24 +21,21 @@
     </para>
    </section>
    <section id="calendar.installation">
-    <title>Installation</title>
+    &reftitle.install;
     <para>
      To get these functions to work, you have to compile PHP with
      <option role="configure">--enable-calendar</option>.
     </para>
    </section>
    <section id="calendar.configuration">
-    <title>Runtime Configuration</title>
-     &no.config;
+    &reftitle.runtime;
+    &no.config;
    </section>
    <section id="calendar.resources">
-    <title>Resource types</title>
+    &reftitle.resources;
     &no.resource;
    </section>
-   <section id="calendar.constants">
-    <title>Predefined constants</title>
-     &no.constants;
-   </section>
+   &reference.calendar.constants;
   </partintro>
 
 &reference.calendar.functions;