Reword

Author: javiereguiluz

reference/configuration/framework.rst

@@ -188,10 +188,20 @@ trust_x_sendfile_type_header
 
 **type**: ``boolean`` **default**: ``false``
 
-This determines whether to trust ``x-sendfile`` header for BinaryFileResponse. If enabled, the
+.. versionadded:: 6.1
+
+    The ``trust_x_sendfile_type_header`` option was introduced in Symfony 6.1.
+
+``X-Sendfile`` is a special HTTP header that tells web servers to replace the
+response contents by the file that is defined in that header. This improves
+performance because files are no longer served by your application but directly
+by the web server.
+
+This configuration option determines whether to trust ``x-sendfile`` header for
+BinaryFileResponse. If enabled, Symfony calls the
 :method:`BinaryFileResponse::trustXSendfileTypeHeader <Symfony\\Component\\HttpFoundation\\BinaryFileResponse::trustXSendfileTypeHeader>`
-method gets called automatically. It becomes the service container parameter
-named ``kernel.trust_x_sendfile_type_header``.
+method automatically. It becomes the service container parameter named
+``kernel.trust_x_sendfile_type_header``.
 
 .. _reference-framework-trusted-headers: