diff --git a/src/HooksterPrinter.php b/src/HooksterPrinter.php
index e5753e5..7c698e8 100644
--- a/src/HooksterPrinter.php
+++ b/src/HooksterPrinter.php
@@ -22,6 +22,27 @@
  * @since   1.0.0
  */
 class HooksterPrinter implements JsonSerializable {
+	/**
+	 * Documentor.
+	 * 
+	 * @var Documentor
+	 */
+	private $documentor;
+
+	/**
+	 * Output interface.
+	 * 
+	 * @var Documentor
+	 */
+	private $output;
+
+	/**
+	 * Type
+	 * 
+	 * @var string
+	 */
+	private $type;
+
 	/**
 	 * Constrcuct Hookster printer.
 	 *