diff --git a/source-tw/chapter1/02_a_swift_tour.md b/source-tw/chapter1/02_a_swift_tour.md
index d673eae6..aec9e0de 100644
--- a/source-tw/chapter1/02_a_swift_tour.md
+++ b/source-tw/chapter1/02_a_swift_tour.md
@@ -513,12 +513,12 @@ enum Rank: Int {
         case .King:
             return "king"
         default:
-            return String(self.rawValue())
+            return String(self.rawValue)
         }
     }
 }
 let ace = Rank.Ace
-let aceRawValue = ace.rawValue()
+let aceRawValue = ace.rawValue
 ```
 
 > 練習：  
diff --git a/source/chapter1/02_a_swift_tour.md b/source/chapter1/02_a_swift_tour.md
index 65f172e7..0d5e34f9 100755
--- a/source/chapter1/02_a_swift_tour.md
+++ b/source/chapter1/02_a_swift_tour.md
@@ -531,12 +531,12 @@ enum Rank: Int {
         case .King:
             return "king"
         default:
-            return String(self.rawValue())
+            return String(self.rawValue)
         }
     }
 }
 let ace = Rank.Ace
-let aceRawValue = ace.rawValue()
+let aceRawValue = ace.rawValue
 ```
 
 > 练习：