diff --git a/appendices/extensions.xml b/appendices/extensions.xml
index fe72cf7ad8..07351c6247 100644
--- a/appendices/extensions.xml
+++ b/appendices/extensions.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.2 $ -->
+<!-- $Revision: 1.3 $ -->
 
 <appendix id="extensions">
  <title>Extension Categorization</title>
@@ -40,6 +40,7 @@
    <section id="refs.basic.php">
     <title>Affecting PHP's Behaviour</title>
     <itemizedlist>
+     <listitem><para><xref linkend="ref.apc"/></para></listitem>
      <listitem><para><xref linkend="ref.apd"/></para></listitem>
      <listitem><para><xref linkend="ref.bcompiler"/></para></listitem>
      <listitem><para><xref linkend="ref.overload"/></para></listitem>
@@ -489,6 +490,7 @@
     These extensions are available from <ulink url="&url.pecl;">PECL</ulink>. More PECL extensions exist but they are not documented in the PHP manual yet.
    </para>
    <itemizedlist>
+    <listitem><para><xref linkend="ref.apc"/></para></listitem>
     <listitem><para><xref linkend="ref.apd"/></para></listitem>
     <listitem><para><xref linkend="ref.bcompiler"/></para></listitem>
     <listitem><para><xref linkend="ref.classkit"/></para></listitem>