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+#############################
+Upgrading from 3.1.2 to 3.1.3
+#############################
+
+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/* directory.
+
+.. note:: If you have any custom developed files in these directories,
+	please make copies of them first.
+
+Step 2: Remove usage of nice_date() helper (deprecation)
+========================================================
+
+The :doc:`Date Helper <../helpers/date_helper>` function ``nice_date()`` is
+no longer useful since the introduction of PHP's `DateTime classes
+<https://secure.php.net/datetime>`_
+
+You can replace it with the following:
+::
+
+	DateTime::createFromFormat($input_format, $input_date)->format($desired_output_format);
+
+Thus, ``nice_date()`` is now deprecated and scheduled for removal in
+CodeIgniter 3.2+.
+
+.. note:: The function is still available, but you're strongly encouraged
+	to remove its usage sooner rather than later.
+
+Step 3: Remove usage of $config['standardize_newlines']
+=======================================================
+
+The :doc:`Input Library <../libraries/input>` would optionally replace
+occurrences of `\r\n`, `\r`, `\n` in input data with whatever the ``PHP_EOL``
+value is on your system - if you've set ``$config['standardize_newlines']``
+to ``TRUE`` in your *application/config/config.php*.
+
+This functionality is now deprecated and scheduled for removal in
+CodeIgniter 3.2.+.
+
+.. note:: The functionality is still available, but you're strongly
+	encouraged to remove its usage sooner rather than later.