diff --git a/http_client.rst b/http_client.rst
index 0d8648643b7..14c73d4eb82 100644
--- a/http_client.rst
+++ b/http_client.rst
@@ -642,6 +642,11 @@ when the streams are large)::
         'body' => $formData->bodyToString(),
     ]);
 
+If you need to add a custom HTTP header to the upload, you can do::
+
+    $headers = $formData->getPreparedHeaders()->toArray();
+    $headers[] = 'X-Foo: bar';
+
 Cookies
 ~~~~~~~