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+Currently the project is in the phase of transforming from pairtwo-only to a generalized view for multiple programs.
+This makes it relatively easy to add other filetypes. However, this process requires rewriting and renaming some functions. This document is dedicated to these adjustments.
+
+## `Sws::readSws` renamed to `ReaderInterface::read`
+
+When you want to read a file, all you need to do is to create an instance of the ReaderInterface and call its read function. This procedure will be the same for any filetype in the library.
+
+I have created a easy class to get to the right class for your file. This IOFactory class currently only has 1 type which is for Pairtwo (starting from version 6). But there will be added other filetypes as well.
+
+### Old code
+```php
+require_once 'vendor/autoload.php';
+$sws = Sws::readSws('<filename>');
+```
+
+### New code
+```php
+require_once 'vendor/autoload.php';
+$reader = IOFactory::createReader('Pairtwo-6');
+$sws = $reader->read('<filename>');