diff --git a/appinfo/update.php b/appinfo/update.php
new file mode 100644
index 00000000..dfc50904
--- /dev/null
+++ b/appinfo/update.php
@@ -0,0 +1,28 @@
+<?php
+/**
+ * ownCloud - Documents App
+ *
+ * @author Victor Dubiniuk
+ * @copyright 2013 Victor Dubiniuk victor.dubiniuk@gmail.com
+ *
+ * This file is licensed under the Affero General Public License version 3 or
+ * later.
+ */
+
+$installedVersion = \OCP\Config::getAppValue('documents', 'installed_version');
+
+if (version_compare($installedVersion, '0.7', '<=')) {
+	\OCP\Config::setAppValue('documents', 'unstable', 'false');
+	$session = new \OCA\Documents\Db_Session();
+	
+	$query = \OC_DB::prepare('UPDATE `*PREFIX*documents_session` SET `genesis_url`=? WHERE `es_id`=?');
+
+	foreach ($session->getCollection() as $sessionData){
+		$sessionData['genesis_url'] = \OCA\Documents\Genesis::DOCUMENTS_DIRNAME . $sessionData['genesis_url'];
+		$query->execute(array(
+			$sessionData['genesis_url'],
+			$sessionData['es_id']
+		));
+		
+	}
+}
\ No newline at end of file
diff --git a/lib/genesis.php b/lib/genesis.php
new file mode 100644
index 00000000..19943394
--- /dev/null
+++ b/lib/genesis.php
@@ -0,0 +1,100 @@
+<?php
+/**
+ * ownCloud - Documents App
+ *
+ * @author Victor Dubiniuk
+ * @copyright 2013 Victor Dubiniuk victor.dubiniuk@gmail.com
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
+ * License as published by the Free Software Foundation; either 
+ * version 3 of the License, or any later version.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU AFFERO GENERAL PUBLIC LICENSE for more details.
+ *  
+ * You should have received a copy of the GNU Lesser General Public 
+ * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ * 
+ */
+
+namespace OCA\Documents;
+
+class Genesis {
+	
+	const DOCUMENTS_DIRNAME='/documents';
+	
+	protected $view;
+	
+	protected $path;
+	
+	protected $hash;
+	
+	
+	/**
+	 * Create new genesis document
+	 * @param OCA\Documents\View $view Filesystem view with root '/user/files'
+	 * @param string $path relative path
+	 * @param string $owner file owner
+	 * */	
+	public function __construct(\OCA\Documents\View $view, $path, $owner){
+		$this->view = new View('/' . $owner);
+		$this->hash = $this->getDocumentHash($view, $path);
+		
+		if (!$this->view->file_exists(self::DOCUMENTS_DIRNAME)){
+			$this->view->mkdir(self::DOCUMENTS_DIRNAME );
+		}
+		
+		$this->path = self::DOCUMENTS_DIRNAME . '/' . $this->hash . '.odt';
+		
+		if (!$this->view->file_exists($this->path)){
+			//copy new genesis to /user/documents/{hash}.odt
+			$proxyStatus = \OC_FileProxy::$enabled;
+			\OC_FileProxy::$enabled = false;
+			$this->view->copy('/files' . $path, $this->path);
+			\OC_FileProxy::$enabled = $proxyStatus;
+		}
+		
+		try {
+			$this->validate($this->view, $this->path);
+		} catch (\Exception $e){
+			throw new \Exception('Failed to copy genesis');
+		}
+	}
+	
+	public function getPath(){
+		return $this->path;
+	}
+	
+	public function getHash(){
+		return $this->hash;
+	}
+	
+	public static function getHashByPath($path){
+		return preg_replace('|([a-zA-Z0-9])*\..*$|', '\1', $path);
+	}
+	
+	protected function getDocumentHash($view, $path){
+		$this->validate($view, $path);
+		return sha1($view->file_get_contents($path));
+	}
+	
+	/**
+	 * Check if genesis is valid
+	 * @param OCA\Documents\View $view 
+	 * @param string $path relative to the view
+	 * @throws \Exception
+	 */
+	protected function validate($view, $path){
+		if (!$view->file_exists($path)){
+			throw new \Exception('Document not found ' . $path);
+		}
+		if (!$view->is_file($path)){
+			throw new \Exception('Object ' . $path . ' is not a file.');
+		}
+		//TODO check if it is a valid odt
+	}
+
+}