From 71b0a79b1d6f5a37b58ebd6449899f412880d67e Mon Sep 17 00:00:00 2001
From: geek5nan <geek5nan@gmail.com>
Date: Thu, 19 Jun 2014 15:03:31 +0800
Subject: [PATCH] update 2.21 Protocols

---
 source/chapter2/21_Protocols.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/source/chapter2/21_Protocols.md b/source/chapter2/21_Protocols.md
index 8260cddb..15254fd6 100755
--- a/source/chapter2/21_Protocols.md
+++ b/source/chapter2/21_Protocols.md
@@ -4,7 +4,7 @@
 # 协议
 -----------------
 
-本页包含内容：
+本页包含内容： 
 
 - [协议的语法（Protocol Syntax）](#protocol_syntax)
 - [对属性的规定（Property Requirements）](#property_requirements)