diff --git a/components/http_foundation.rst b/components/http_foundation.rst
index 03f054412e4..225726ab550 100644
--- a/components/http_foundation.rst
+++ b/components/http_foundation.rst
@@ -547,13 +547,22 @@ class, which can make this even easier::
use Symfony\Component\HttpFoundation\JsonResponse;
+ // if you know the data to send when creating the response
+ $response = new JsonResponse(array('data' => 123));
+
+ // if you don't know the data to send when creating the response
$response = new JsonResponse();
- $response->setData(array(
- 'data' => 123
- ));
+ // ...
+ $response->setData(array('data' => 123));
+
+ // if the data to send is already encoded in JSON
+ $response = JsonResponse::fromJsonString('{ "data": 123 }');
+
+.. versionadded:: 3.2
+ The ``JsonResponse::fromJsonString()`` method was added in Symfony 3.2.
-This encodes your array of data to JSON and sets the ``Content-Type`` header
-to ``application/json``.
+The ``JsonResponse`` class sets the ``Content-Type`` header to
+``application/json`` and encodes your data to JSON when needed.
.. caution::
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