diff --git a/components/http_foundation/introduction.rst b/components/http_foundation/introduction.rst
index 0ac55ba928c..fba042f0e99 100644
--- a/components/http_foundation/introduction.rst
+++ b/components/http_foundation/introduction.rst
@@ -483,6 +483,9 @@ abstracts the hard work behind a simple API::
 
     $response->headers->set('Content-Disposition', $d);
 
+Then you must set the file's content as usual, for example by using
+:method:`Symfony\\Component\\HttpFoundation\\Response::setContent`.
+
 Alternatively, if you are serving a static file, you can use a
 :class:`Symfony\\Component\\HttpFoundation\\BinaryFileResponse`::