From 2bd7b1e5b944d6a8ae8de11da10a8d7805ab8a94 Mon Sep 17 00:00:00 2001
From: Juanito Fatas <katehuang0320@gmail.com>
Date: Fri, 4 Oct 2013 16:35:33 +0800
Subject: [ci skip] Add explanation on Rack::Sendfile and fix serve static
 files setting.

---
 guides/source/rails_on_rack.md | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/guides/source/rails_on_rack.md b/guides/source/rails_on_rack.md
index 642c70fd9d..d53e0cd2bd 100644
--- a/guides/source/rails_on_rack.md
+++ b/guides/source/rails_on_rack.md
@@ -225,9 +225,13 @@ config.middleware.delete "Rack::MethodOverride"
 
 Much of Action Controller's functionality is implemented as Middlewares. The following list explains the purpose of each of them:
 
+ **`Rack::Sendfile`**
+
+* Sets server specific X-Sendfile header. Configure this via `config.action_dispatch.x_sendfile_header` option.
+
  **`ActionDispatch::Static`**
 
-* Used to serve static assets. Disabled if `config.serve_static_assets` is true.
+* Used to serve static assets. Disabled if `config.serve_static_assets` is `false`.
 
  **`Rack::Lock`**
 
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