diff --git a/src/Notification/Notifier.php b/src/Notification/Notifier.php
index e9f83ebe..828c56d5 100644
--- a/src/Notification/Notifier.php
+++ b/src/Notification/Notifier.php
@@ -177,6 +177,7 @@ protected function executeNotifyCommand($command)
 
     /**
      * @return boolean
+     * @since Method available since Release 4.1.0
      */
     protected function hasGrowl()
     {
diff --git a/src/Util/OS.php b/src/Util/OS.php
index 88033008..d2efe0b3 100644
--- a/src/Util/OS.php
+++ b/src/Util/OS.php
@@ -80,6 +80,7 @@ public function isDarwin()
 
     /**
      * @return boolean
+     * @since Method available since Release 4.1.0
      */
     public function isAfterMarvericks()
     {