diff --git a/source/chapter2/21_Protocols.md b/source/chapter2/21_Protocols.md
index 10cf86c3..62f939f7 100755
--- a/source/chapter2/21_Protocols.md
+++ b/source/chapter2/21_Protocols.md
@@ -435,7 +435,7 @@ extension Hamster: TextRepresentable {}
 
 ```swift
 let simonTheHamster = Hamster(name: "Simon")
-let somethingTextRepresentable: TextRepresentable = simonTheHamester
+let somethingTextRepresentable: TextRepresentable = simonTheHamster
 println(somethingTextRepresentable.asText())
 // 输出 "A hamster named Simon"
 ```
@@ -448,7 +448,7 @@ println(somethingTextRepresentable.asText())
 协议类型可以被集合使用，表示集合中的元素均为协议类型:
 
 ```swift
-let things: TextRepresentable[] = [game,d12,simoTheHamster]
+let things: TextRepresentable[] = [game,d12,simonTheHamster]
 ```
 
 如下所示，`things`数组可以被直接遍历，并调用其中元素的`asText()`函数: