Documentation.

Mage/Config.php

@@ -184,6 +184,8 @@ class Config
      * Return the a parameter
      *
      * @param string $name
+     * @param mixed $default
+     * @param array $extraParameters
      * @return mixed
      */
     public function getParameter($name, $default = null, $extraParameters = array())

Mage/Task/AbstractTask.php

@@ -123,6 +123,7 @@ abstract class AbstractTask
      * Returns a Parameter, or a default if not found
      *
      * @param string $name
+     * @param mixed $default
      * @return mixed
      */
     public function getParameter($name, $default = null)

Mage/Task/Factory.php

@@ -27,7 +27,9 @@ class Factory
      * Gets an instance of a Task.
      *
      * @param string|array $taskData
+     * @param Mage\Config $taskConfig
      * @param boolean $inRollback
+     * @param string $stage
      * @return \Mage\Task\AbstractTask
      */
     public static function get($taskData, Config $taskConfig, $inRollback = false, $stage = null)