diff --git a/Composite/Form.php b/Composite/Form.php
index 0cc16e1..decc599 100644
--- a/Composite/Form.php
+++ b/Composite/Form.php
@@ -3,7 +3,7 @@
 namespace DesignPatterns\Composite;
 
 /**
- * composite pattern
+ * Composite pattern
  *
  * Purpose:
  * to treat a group of objects the same way as a single instance of the object
@@ -18,7 +18,10 @@ namespace DesignPatterns\Composite;
  */
 class Form extends FormElement
 {
-    protected $_elements;
+    /**
+     * @var array|FormElement[]
+     */
+    protected $elements;
 
     /**
      * runs through all elements and calls render() on them, then returns the complete representation
@@ -26,20 +29,26 @@ class Form extends FormElement
      *
      * from the outside, one will not see this and the form will act like a single object instance
      *
+     * @param int $indent
+     *
      * @return string
      */
     public function render($indent = 0)
     {
         $formCode = '';
-        foreach ($this->_elements as $element) {
+
+        foreach ($this->elements as $element) {
             $formCode .= $element->render($indent + 1) . PHP_EOL;
         }
 
         return $formCode;
     }
 
+    /**
+     * @param FormElement $element
+     */
     public function addElement(FormElement $element)
     {
-        $this->_elements[] = $element;
+        $this->elements[] = $element;
     }
 }
diff --git a/Composite/FormElement.php b/Composite/FormElement.php
index 3e3de93..ab95c67 100644
--- a/Composite/FormElement.php
+++ b/Composite/FormElement.php
@@ -2,7 +2,17 @@
 
 namespace DesignPatterns\Composite;
 
+/**
+ * Class FormElement
+ */
 abstract class FormElement
 {
+    /**
+     * renders the elements' code
+     *
+     * @param int $indent
+     *
+     * @return mixed
+     */
     abstract public function render($indent = 0);
 }
diff --git a/Composite/InputElement.php b/Composite/InputElement.php
index 786df45..7a65241 100644
--- a/Composite/InputElement.php
+++ b/Composite/InputElement.php
@@ -2,8 +2,18 @@
 
 namespace DesignPatterns\Composite;
 
+/**
+ * Class InputElement
+ */
 class InputElement extends FormElement
 {
+    /**
+     * renders the input element HTML
+     *
+     * @param int $indent
+     *
+     * @return mixed|string
+     */
     public function render($indent = 0)
     {
         return str_repeat('  ', $indent) . '<input type="text" />';
diff --git a/Composite/TextElement.php b/Composite/TextElement.php
index c8214ca..9ea4a4e 100644
--- a/Composite/TextElement.php
+++ b/Composite/TextElement.php
@@ -2,8 +2,18 @@
 
 namespace DesignPatterns\Composite;
 
+/**
+ * Class TextElement
+ */
 class TextElement extends FormElement
 {
+    /**
+     * renders the text element
+     *
+     * @param int $indent
+     *
+     * @return mixed|string
+     */
     public function render($indent = 0)
     {
         return str_repeat('  ', $indent) . 'this is a text element';