From 52d168a67db08b01bb3311f871a2ee32302e4e9e Mon Sep 17 00:00:00 2001
From: TheLittleBoy <TheLittleBoy@users.noreply.github.com>
Date: Sun, 29 Jun 2014 21:54:32 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BB=A3=E7=A0=81=E7=BC=96=E5=86=99=E9=94=99?=
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多写了一个空格，导致编译错误。  特此修正
---
 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..ea57a991 100755
--- a/source/chapter2/21_Protocols.md
+++ b/source/chapter2/21_Protocols.md
@@ -108,7 +108,7 @@ class Starship: FullyNamed {
 		self.prefix = prefix
 	}
 	var fullName: String {
-	return (prefix ? prefix ! + " " : " ") + name
+	return (prefix ? prefix! + " " : " ") + name
 	}
 }
 var ncc1701 = Starship(name: "Enterprise", prefix: "USS")