diff --git a/files/files.php b/files/files.php
index d4c75aa..bd84f96 100644
--- a/files/files.php
+++ b/files/files.php
@@ -1,12 +1,41 @@
 <?php
+/**
+ * System - PHP Framework
+ *
+ * PHP Version 5.6
+ *
+ * @copyright   2016 Ulf Gebhardt (http://www.webcraft-media.de)
+ * @license     http://www.opensource.org/licenses/mit-license.php MIT
+ * @link        https://github.com/webcraftmedia/system
+ * @package     SYSTEM\FILES
+ */
 namespace SYSTEM\FILES;
 
+/**
+ * Files Class provided by System to register folders and serve files.
+ */
 class files {
+    /** array Variable to store all registred file folders*/
     private static $folders = array(); //only strings!   array(catname => path)
 
+    /**
+     * Register a filefolder
+     *
+     * @param string $path Path of the Folder
+     * @param string $cat Category to register that folder to
+     * @return null Returns null.
+     */
     public static function registerFolder($path, $cat) {
         self::$folders[$cat] = $path;}
 
+    /**
+     * Retrieve a File
+     *
+     * @param string $cat Category to query or null
+     * @param string $id File to query or null
+     * @param bool $returnasjson Determines if you recieve Arrays or JSON results
+     * @return mixed Returns List of Folders if cat is null, List of Files of id is null or Streams the requested File.
+     */
     public static function get($cat = null, $id = null, $returnasjson = false) {
         if (!$cat) {
             return $returnasjson ? \SYSTEM\LOG\JsonResult::toString(self::$folders) : self::$folders;}
@@ -35,13 +64,28 @@ class files {
             throw new \SYSTEM\LOG\ERROR("Could not transfere File.");}
         return;
     }
-
+    
+    /**
+     * Move a uploaded File into a Directtory
+     *
+     * @param string $cat Category for the File
+     * @param string $id ID for the File
+     * @param ressource $contents Uploaded File Ressource
+     * @return bool Returns true or false or throws an Error.
+     */
     public static function put($cat, $id, $contents) {
         if (!array_key_exists($cat, self::$folders)) {
             throw new \SYSTEM\LOG\ERROR("No matching Cat '" . $cat . "' found.");}        
         return move_uploaded_file($contents, self::$folders[$cat].$id);        
     }
     
+    /**
+     * Delete a File
+     *
+     * @param string $cat Category of the File
+     * @param string $id ID of the File
+     * @return bool Returns true or false or throws an Error.
+     */
     public static function delete($cat, $id) {        
         if (!array_key_exists($cat, self::$folders)) {
             throw new \SYSTEM\LOG\ERROR("No matching Cat '" . $cat . "' found.");}
@@ -50,6 +94,14 @@ class files {
         return unlink(self::$folders[$cat].$id); 
     }
     
+    /**
+     * Rename a File
+     *
+     * @param string $cat Category of the File
+     * @param string $id ID of the File
+     * @param string $newid ID of the renamed File
+     * @return bool Returns true or false or throws an Error.
+     */
     public static function rename($cat, $id, $newid) {        
         if (!array_key_exists($cat, self::$folders)) {
             throw new \SYSTEM\LOG\ERROR("No matching Cat '" . $cat . "' found.");}
@@ -59,6 +111,12 @@ class files {
         return rename(self::$folders[$cat].$id, self::$folders[$cat].$newid.'.'.$ext['extension']); 
     }
 
+    /**
+     * Returns the contents of a Folder
+     *
+     * @param string $folder Path to the Folder
+     * @return array Returns a list of Files in the directory.
+     */
     private static function getFolder($folder) {
         $files = array();
         foreach (glob($folder.'*') as $file) {
@@ -66,18 +124,31 @@ class files {
         return $files;
     }
 
+    /**
+     * Returns a URL for a File
+     *
+     * @param string $cat Category of the File
+     * @param string $id ID of the File
+     * @return string Returns URL of the File.
+     */
     public static function getURL($cat, $id = null) {
         return \SYSTEM\CONFIG\config::get(\SYSTEM\CONFIG\config_ids::SYS_CONFIG_PATH_BASEURL) . 'api.php?call=files&cat=' . $cat . '&id=' . $id;}
    
-    private static function file_get_contents_chunked($file,$chunk_size,$callback)
-    {
+    /**
+     * Returns Chunks of a File
+     * Callback: function($chunk,&$handle,$iteration)
+     *
+     * @param string $file Path of the File
+     * @param int $chunk_size Size of the Chunks
+     * @param function $callback Callback function which is called for every chunk
+     * @return bool Returns true.
+     */
+    private static function file_get_contents_chunked($file,$chunk_size,$callback){
         $handle = fopen($file, "r");
         $i = 0;
-        while (!feof($handle))
-        {
+        while (!feof($handle)){
             call_user_func_array($callback,array(fread($handle,$chunk_size),&$handle,$i));
-            $i++;
-        }
+            $i++;}
         fclose($handle);
         return true;
     }