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+#############################
+Upgrading from 1.6.3 to 1.7.0
+#############################
+
+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:
+
+-  system/codeigniter
+-  system/database
+-  system/helpers
+-  system/language
+-  system/libraries
+
+.. note:: If you have any custom developed files in these folders please
+	make copies of them first.
+
+Step 2: Update your Session Table
+=================================
+
+If you are using the Session class in your application, AND if you are
+storing session data to a database, you must add a new column named
+user_data to your session table. Here is an example of what this column
+might look like for MySQL::
+
+	user_data text NOT NULL
+
+To add this column you will run a query similar to this::
+
+	ALTER TABLE `ci_sessions` ADD `user_data` text NOT NULL
+
+You'll find more information regarding the new Session functionality in
+the :doc:`Session class <../libraries/sessions>` page.
+
+Step 3: Update your Validation Syntax
+=====================================
+
+This is an **optional**, but recommended step, for people currently
+using the Validation class. CI 1.7 introduces a new :doc:`Form Validation
+class <../libraries/form_validation>`, which deprecates the old
+Validation library. We have left the old one in place so that existing
+applications that use it will not break, but you are encouraged to
+migrate to the new version as soon as possible. Please read the user
+guide carefully as the new library works a little differently, and has
+several new features.
+
+Step 4: Update your user guide
+==============================
+
+Please replace your local copy of the user guide with the new version,
+including the image files.