diff --git a/user_guide/changelog.html b/user_guide/changelog.html
index 3b4e0bf..58bf1b6 100644
--- a/user_guide/changelog.html
+++ b/user_guide/changelog.html
@@ -65,8 +65,9 @@
 <h2>Version 1.5.4</h2>
 <p>Release Date: -- </p>
 <ul>
+    <li>Fixed a typo in the <a href="./libraries/calendar.html">Calendar library </a> </li>
     <li>Fixed a typo in rpcs.php library</li>
-    <li>Fixed a bug in the Zip library, providing PC Zip file compatibility with Mac OS X</li>
+    <li>Fixed a bug in the <a href="./libraries/zip.html">Zip library</a>, providing PC Zip file compatibility with Mac OS X</li>
     <li>APPVER has been deprecated and replaced with CI_VERSION for clarity. </li>
     <li>Added array to string into the profiler </li>
     <li>Fixed a bug in router that was ignoring the scaffolding route for optimization </li>
diff --git a/user_guide/installation/upgrade_153.html b/user_guide/installation/upgrade_153.html
new file mode 100644
index 0000000..bc8fd57
--- /dev/null
+++ b/user_guide/installation/upgrade_153.html
@@ -0,0 +1,107 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<html>
+<head>
+
+<title>CodeIgniter User Guide</title>
+
+<style type='text/css' media='all'>@import url('../userguide.css');</style>
+<link rel='stylesheet' type='text/css' media='all' href='../userguide.css' />
+
+<script type="text/javascript" src="../nav/nav.js"></script>
+<script type="text/javascript" src="../nav/prototype.lite.js"></script>
+<script type="text/javascript" src="../nav/moo.fx.js"></script>
+<script type="text/javascript">
+window.onload = function() {
+	myHeight = new fx.Height('nav', {duration: 400});
+	myHeight.hide();
+}
+</script>
+
+<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+<meta http-equiv='expires' content='-1' />
+<meta http-equiv= 'pragma' content='no-cache' />
+<meta name='robots' content='all' />
+<meta name='author' content='Rick Ellis' />
+<meta name='description' content='CodeIgniter User Guide' />
+
+</head>
+<body>
+
+<!-- START NAVIGATION -->
+<div id="nav"><div id="nav_inner"><script type="text/javascript">create_menu('../');</script></div></div>
+<div id="nav2"><a name="top"></a><a href="javascript:void(0);" onclick="myHeight.toggle();"><img src="../images/nav_toggle.jpg" width="153" height="44" border="0" title="Toggle Table of Contents" alt="Toggle Table of Contents" /></a></div>
+<div id="masthead">
+<table cellpadding="0" cellspacing="0" border="0" style="width:100%">
+<tr>
+<td><h1>CodeIgniter User Guide Version 1.5.3</h1></td>
+<td id="breadcrumb_right"><a href="../toc.html">Table of Contents Page</a></td>
+</tr>
+</table>
+</div>
+<!-- END NAVIGATION -->
+
+
+<!-- START BREADCRUMB -->
+<table cellpadding="0" cellspacing="0" border="0" style="width:100%">
+<tr>
+<td id="breadcrumb">
+<a href="http://www.codeigniter.com/">CodeIgniter Home</a> &nbsp;&#8250;&nbsp;
+<a href="../index.html">User Guide Home</a> &nbsp;&#8250;&nbsp;
+Upgrading from 1.5.0 to 1.5.2
+</td>
+<td id="searchbox"><form method="get" action="http://www.google.com/search"><input type="hidden" name="as_sitesearch" id="as_sitesearch" value="www.codeigniter.com/user_guide/" />Search User Guide&nbsp; <input type="text" class="input" style="width:200px;" name="q" id="q" size="31" maxlength="255" value="" />&nbsp;<input type="submit" class="submit" name="sa" value="Go" /></form></td>
+</tr>
+</table>
+<!-- END BREADCRUMB -->
+
+<br clear="all" />
+
+
+<!-- START CONTENT -->
+<div id="content">
+
+<h1>Upgrading from 1.5.2 to 1.5.3</h1>
+
+<p>Before performing an update you should take your site offline by replacing the index.php file with a static one.</p>
+
+
+
+<h2>Step 1: Update your CodeIgniter files</h2>
+
+<p>Replace these files and directories in your "system" folder with the new versions:
+
+<ul>
+
+<li><dfn>system/database/drivers</dfn></li>
+<li><dfn>system/helpers</dfn></li>
+<li><dfn>system/libraries/Input.php</dfn></li>
+<li><dfn>system/libraries/Loader.php</dfn></li>
+<li><dfn>system/libraries/Profiler.php</dfn></li>
+<li><dfn>system/libraries/Table.php</dfn></li>
+</ul>
+
+<p class="important"><strong>Note:</strong> If you have any custom developed files in these folders please make copies of them first.</p>
+
+
+<h2>Step 2: Update your user guide</h2>
+
+<p>Please also replace your local copy of the user guide with the new version.</p>
+
+</div>
+<!-- END CONTENT -->
+
+
+<div id="footer">
+<p>
+Previous Topic:&nbsp;&nbsp;<a href="index.html">Installation Instructions</a>
+&nbsp;&nbsp;&nbsp;&middot;&nbsp;&nbsp;
+<a href="#top">Top of Page</a>&nbsp;&nbsp;&nbsp;&middot;&nbsp;&nbsp;
+<a href="../index.html">User Guide Home</a>&nbsp;&nbsp;&nbsp;&middot;&nbsp;&nbsp;
+Next Topic:&nbsp;&nbsp;<a href="../overview/at_a_glance.html">CodeIgniter at a Glance</a>
+<p>
+
+<p><a href="http://www.codeigniter.com">CodeIgniter</a> &nbsp;&middot;&nbsp; Copyright &#169; 2007 &nbsp;&middot;&nbsp; <a href="http://ellislab.com/">Ellislab, Inc.</a></p>
+</div>
+
+</body>
+</html>
\ No newline at end of file