diff --git a/src/Symfony/Component/DependencyInjection/ChildDefinition.php b/src/Symfony/Component/DependencyInjection/ChildDefinition.php
index 29fbd48f2d..123b387475 100644
--- a/src/Symfony/Component/DependencyInjection/ChildDefinition.php
+++ b/src/Symfony/Component/DependencyInjection/ChildDefinition.php
@@ -89,7 +89,7 @@ class ChildDefinition extends Definition
      * @param int|string $index
      * @param mixed      $value
      *
-     * @return self the current instance
+     * @return $this
      *
      * @throws InvalidArgumentException when $index isn't an integer
      */