diff --git a/routing/redirect_in_config.rst b/routing/redirect_in_config.rst
index 1ea30cb61b9..3712de69044 100644
--- a/routing/redirect_in_config.rst
+++ b/routing/redirect_in_config.rst
@@ -159,6 +159,9 @@ action:
return $routes;
+.. versionadded:: 4.1
+ The ``keepQueryParams`` option was introduced in Symfony 4.1.
+
.. caution::
Because you are redirecting to a route instead of a path, the required
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