diff --git a/templates.rst b/templates.rst
index b6ae333cee1..85d2467b79d 100644
--- a/templates.rst
+++ b/templates.rst
@@ -704,6 +704,9 @@ provided by Symfony:
                 context:
                     site_name: 'ACME'
                     theme: 'dark'
+                
+                # add some headers in response
+                headers:  { 'Content-Type': 'image/svg+xml' }
 
     .. code-block:: xml