diff --git a/src/Core/Plugin.php b/src/Core/Plugin.php
index 8ec8d64448e..d25b98c897a 100644
--- a/src/Core/Plugin.php
+++ b/src/Core/Plugin.php
@@ -409,6 +409,7 @@ protected static function _includeFile($file, $ignoreMissing = false)
     /**
      * Get the shared plugin collection.
      *
+     * @internal
      * @return \Cake\Core\PluginCollection
      */
     public static function getCollection()