diff --git a/components/http_foundation/introduction.rst b/components/http_foundation/introduction.rst
index 87c6bf8f546..0fe7e19ce40 100644
--- a/components/http_foundation/introduction.rst
+++ b/components/http_foundation/introduction.rst
@@ -467,6 +467,11 @@ the response content will look like this:
 
     handleResponse({'data': 123});
 
+.. versionadded:: 2.3
+    The :method:`Symfony\\Component\\HttpFoundation\\JsonResponse::prefixJson` has
+    been added to help mitigating CSRF attacks when sending a JSON response. The
+    prefix should be stripped on the client side before the JSON is parsed.
+
 Session
 -------