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+#############################
+Upgrading from 1.4.1 to 1.5.0
+#############################
+
+.. note:: The instructions on this page assume you are running version
+	1.4.1. If you have not upgraded to that version please do so first.
+
+Before performing an update you should take your site offline by
+replacing the index.php file with a static one.
+
+Step 1: Update your CodeIgniter files
+=====================================
+
+Replace these files and directories in your "system" folder with the new
+versions:
+
+-  application/config/user_agents.php (new file for 1.5)
+-  application/config/smileys.php (new file for 1.5)
+-  codeigniter/
+-  database/ (new folder for 1.5. Replaces the "drivers" folder)
+-  helpers/
+-  language/
+-  libraries/
+-  scaffolding/
+
+.. note:: If you have any custom developed files in these folders please
+	make copies of them first.
+
+Step 2: Update your database.php file
+=====================================
+
+Open your application/config/database.php file and add these new items::
+
+
+    $db['default']['cache_on'] = FALSE;
+    $db['default']['cachedir'] = '';
+
+Step 3: Update your config.php file
+===================================
+
+Open your application/config/config.php file and ADD these new items::
+
+
+    /*
+    |--------------------------------------------------------------------------
+    | Class Extension Prefix
+    |--------------------------------------------------------------------------
+    |
+    | This item allows you to set the filename/classname prefix when extending
+    | native libraries.  For more information please see the user guide:
+    |
+    | http://codeigniter.com/user_guide/general/core_classes.html
+    | http://codeigniter.com/user_guide/general/creating_libraries.html
+    |
+    */
+    $config['subclass_prefix'] = 'MY_';
+
+    /*
+    |--------------------------------------------------------------------------
+    | Rewrite PHP Short Tags
+    |--------------------------------------------------------------------------
+    |
+    | If your PHP installation does not have short tag support enabled CI
+    | can rewrite the tags on-the-fly, enabling you to utilize that syntax
+    | in your view files.  Options are TRUE or FALSE (boolean)
+    |
+    */
+    $config['rewrite_short_tags'] = FALSE;
+
+In that same file REMOVE this item::
+
+
+    /*
+    |--------------------------------------------------------------------------
+    | Enable/Disable Error Logging
+    |--------------------------------------------------------------------------
+    |
+    | If you would like errors or debug messages logged set this variable to
+    | TRUE (boolean).  Note: You must set the file permissions on the "logs" folder
+    | such that it is writable.
+    |
+    */
+    $config['log_errors'] = FALSE;
+
+Error logging is now disabled simply by setting the threshold to zero.
+
+Step 4: Update your main index.php file
+=======================================
+
+If you are running a stock index.php file simply replace your version
+with the new one.
+
+If your index.php file has internal modifications, please add your
+modifications to the new file and use it.
+
+Step 5: Update your user guide
+==============================
+
+Please also replace your local copy of the user guide with the new
+version.