diff --git a/src/engine/Api/V1/Authorization.php b/src/engine/Api/V1/Authorization.php
index 92460dd0..3fdc6c59 100644
--- a/src/engine/Api/V1/Authorization.php
+++ b/src/engine/Api/V1/Authorization.php
@@ -18,7 +18,7 @@ use \EA\Engine\Types\NonEmptyString;
 /**
  * API v1 Authorization Class 
  *
- * This class will handle the authorization procedure.
+ * This class will handle the authorization procedure of the API.
  */
 class Authorization {
     /**
diff --git a/src/engine/Api/V1/Parsers/Appointments.php b/src/engine/Api/V1/Parsers/Appointments.php
index 83828c9e..e0b3b8b7 100644
--- a/src/engine/Api/V1/Parsers/Appointments.php
+++ b/src/engine/Api/V1/Parsers/Appointments.php
@@ -13,7 +13,17 @@
 
 namespace EA\Engine\Api\V1\Parsers; 
 
+/**
+ * Appointments Parser 
+ *
+ * This class will handle the encoding and decoding from the API requests. 
+ */
 class Appointments implements ParsersInterface {
+    /**
+     * Encode Response Array 
+     * 
+     * @param array &$response The response to be encoded.
+     */
     public function encode(array &$response) {
         $encodedResponse = [
             'id' => $response['id'] !== null ? (int)$response['id'] : null,
@@ -31,6 +41,12 @@ class Appointments implements ParsersInterface {
         $response = $encodedResponse; 
     }
 
+    /**
+     * Decode Request 
+     * 
+     * @param array &$request The request to be decoded. 
+     * @param array $base Optional (null), if provided it will be used as a base array. 
+     */
     public function decode(array &$request, array $base = null) {
         $decodedRequest = $base ?: []; 
 
diff --git a/src/engine/Api/V1/Parsers/ParsersInterface.php b/src/engine/Api/V1/Parsers/ParsersInterface.php
index 147615ca..8ec7322b 100644
--- a/src/engine/Api/V1/Parsers/ParsersInterface.php
+++ b/src/engine/Api/V1/Parsers/ParsersInterface.php
@@ -13,7 +13,24 @@
 
 namespace EA\Engine\Api\V1\Parsers;
 
+/**
+ * Parsers Interface
+ *
+ * Every parser needs the "encode" and "decode" methods. 
+ */
 interface ParsersInterface {
+    /**
+     * Encode Response Array 
+     * 
+     * @param array &$response The response to be encoded.
+     */
     public function encode(array &$response);
-    public function decode(array &$request);
+
+    /**
+     * Decode Request 
+     * 
+     * @param array &$request The request to be decoded. 
+     * @param array $base Optional (null), if provided it will be used as a base array. 
+     */
+    public function decode(array &$request, array $base = null);
 } 
diff --git a/src/engine/Api/V1/Processors/Filter.php b/src/engine/Api/V1/Processors/Filter.php
index fb432f95..0fdaa8dd 100644
--- a/src/engine/Api/V1/Processors/Filter.php
+++ b/src/engine/Api/V1/Processors/Filter.php
@@ -13,9 +13,22 @@
 
 namespace EA\Engine\Api\V1\Processors; 
 
+/**
+ * Filter Processor 
+ *
+ * This class will handle custom filters upon the response array. In some specific cases it might be 
+ * easier to apply some custom filtering in order to get the required results. 
+ *
+ * @todo Implement this processor class.
+ */
 class Filter implements ProcessorsInterface {
- {
+{
+    /**
+     * Process Response Array
+     * 
+     * @param array &$response The response array to be processed.
+     */
     public static function process(array &$response) {
-        // will be implemented at a later point
+        // Not implemented yet.
     }
 }
diff --git a/src/engine/Api/V1/Processors/Minimize.php b/src/engine/Api/V1/Processors/Minimize.php
index 282d3b49..350fcc66 100644
--- a/src/engine/Api/V1/Processors/Minimize.php
+++ b/src/engine/Api/V1/Processors/Minimize.php
@@ -13,7 +13,26 @@
 
 namespace EA\Engine\Api\V1\Processors; 
 
+/**
+ * Minimize Processor 
+ *
+ * This processor will check for the "fields" GET parameters and provide only the required fields in
+ * every response entry. This might come in handy when the client needs specific information and not
+ * the whole objects. 
+ *
+ * Make sure that the response parameter is a sequential array and not a single entry by the time this 
+ * processor is executed.
+ */
 class Minimize implements ProcessorsInterface {
+    /**
+     * Process Response Array 
+     *
+     * Example: 
+     *   http://ea-installation.com/api/v1/appointments?fields=id,book,start,end
+     *   
+     * 
+     * @param array &$response The response array to be processed.
+     */
     public static function process(array &$response) {
         if (!isset($_GET['fields'])) {
             return; 
diff --git a/src/engine/Api/V1/Processors/Paginate.php b/src/engine/Api/V1/Processors/Paginate.php
index 83b400d9..b8eadcae 100644
--- a/src/engine/Api/V1/Processors/Paginate.php
+++ b/src/engine/Api/V1/Processors/Paginate.php
@@ -13,7 +13,25 @@
 
 namespace EA\Engine\Api\V1\Processors; 
 
+/**
+ * Paginate Processor 
+ *
+ * This class will handle the pagination GET parameters ("page", "length"). The "page" parameter
+ * is required in order for the pagination to work. The "length" is optional and the default value
+ * is 20 entries per page. 
+ *
+ * Make sure that the response parameter is a sequential array and not a single entry by the time this 
+ * processor is executed.
+ */
 class Paginate implements ProcessorsInterface {
+    /**
+     * Process Response Array 
+     *
+     * Example: 
+     *   http://ea-installation.com/api/v1/appointments?page=3&length=30
+     * 
+     * @param array &$response The response array to be processed.
+     */
     public static function process(array &$response) {
         if (!isset($_GET['page'])) {
             return; 
diff --git a/src/engine/Api/V1/Processors/Search.php b/src/engine/Api/V1/Processors/Search.php
index a4a774c1..b22eba05 100644
--- a/src/engine/Api/V1/Processors/Search.php
+++ b/src/engine/Api/V1/Processors/Search.php
@@ -13,7 +13,19 @@
 
 namespace EA\Engine\Api\V1\Processors; 
 
+/**
+ * Search Processor
+ *
+ * This class will search the response with the "q" GET parameter and only provide the entries
+ * that match the keyword. Make sure that the response parameter is a sequential array and not 
+ * a single entry by the time this processor is executed.
+ */
 class Search implements ProcessorsInterface {
+    /**
+     * Process Response Array
+     * 
+     * @param array &$response The response array to be processed.
+     */
     public static function process(array &$response) {
         if (!isset($_GET['q'])) {
             return;
@@ -31,6 +43,14 @@ class Search implements ProcessorsInterface {
         $response = $searchedResponse;
     }
 
+    /**
+     * Recursive Array Search 
+     * 
+     * @param array $haystack Array to search in. 
+     * @param string $needle Keyword to be searched.
+     * 
+     * @return int|bool Returns the index of the search occurence or false it nothing was found.
+     */
     protected static function _recursiveArraySearch(array $haystack, $needle) {
         foreach ($haystack as $key => $value) {
             $currentKey = $key;
diff --git a/src/engine/Api/V1/Processors/Sort.php b/src/engine/Api/V1/Processors/Sort.php
index 1f1d82ca..7c72d67c 100644
--- a/src/engine/Api/V1/Processors/Sort.php
+++ b/src/engine/Api/V1/Processors/Sort.php
@@ -13,9 +13,19 @@
 
 namespace EA\Engine\Api\V1\Processors; 
 
+/**
+ * Sort Processor
+ *
+ * This class will sort the response array with the provided GET parameters. Make sure that the 
+ * response parameter is a sequential array and not a single entry by the time this processor is
+ * executed.
+ */
 class Sort implements ProcessorsInterface {
     /**
-     * Supports up to 3 fields.
+     * Supports up to 3 columns for sorting.
+     *
+     * Example: 
+     *   http://ea-installation.com/api/v1/appointments?sort=-start,+notes,-hash
      * 
      * @param array &$response The response array to be processed.
      */