From b6c7772991f1d456ebeb2d52dd6add319ae36bbc Mon Sep 17 00:00:00 2001
From: TheLittleBoy <TheLittleBoy@users.noreply.github.com>
Date: Sun, 29 Jun 2014 23:18:29 +0800
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代码编写错误，导致编译失败。 特此纠正。
---
 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 e1173fce..68c0ff75 100755
--- a/source/chapter2/21_Protocols.md
+++ b/source/chapter2/21_Protocols.md
@@ -407,7 +407,7 @@ println(d12.asText())
 `SnakesAndLadders`类也可以通过`扩展`的方式来遵循协议：
 
 ```swift
-extension SnakeAndLadders: TextRepresentable {
+extension SnakesAndLadders: TextRepresentable {
 	func asText() -> String {
 		return "A game of Snakes and Ladders with \(finalSquare) squares"
 	}