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+#############################
+Upgrading from 2.1.0 to 3.0.0
+#############################
+
+.. note:: These upgrade notes are for a version that is yet to be released.
+
+
+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 all files and directories in your "system" folder and replace
+your index.php file. If any modifications were made to your index.php
+they will need to be made fresh in this new one.
+
+.. note:: If you have any custom developed files in these folders please
+	make copies of them first.
+
+Step 2: Change References to the SHA Library
+============================================
+
+The previously deprecated SHA library has been removed in CodeIgniter 3.0.
+Alter your code to use the native `sha1()` PHP function to generate a sha1 hash.
+
+Additionally, the `sha1()` method in the :doc:`Encryption Library <../libraries/encryption>` has been removed.
+
+Step 3: Remove $autoload['core'] from your config/autoload.php
+==============================================================
+
+Use of the `$autoload['core']` config array has been deprecated as of CodeIgniter 1.4.1 and is now removed.
+Move any entries that you might have listed there to `$autoload['libraries']` instead.
+
+Step 4: Update your config/database.php
+=======================================
+
+Due to 3.0.0's renaming of Active Record to Query Builder, inside your _config/database.php_, you will
+need to rename the `$active_record` variable to `$query_builder`.
+
+    $active_group = 'default';
+    // $active_record = TRUE;
+    $query_builder = TRUE;
+    
+Step 5: Move your errors folder
+===============================
+
+In version 3.0.0, the errors folder has been moved from "application/errors" to "application/views/errors".
+\ No newline at end of file