diff --git a/source/chapter2/04_Collection_Types.md b/source/chapter2/04_Collection_Types.md
index 6a1be08e..c545d875 100644
--- a/source/chapter2/04_Collection_Types.md
+++ b/source/chapter2/04_Collection_Types.md
@@ -284,7 +284,7 @@ Swift 的字典使用`Dictionary<KeyType, ValueType>`定义,其中`KeyType`是
     // Airport code: TYO
     // Airport code: LHR
 
-    for airportName in airports。values {
+    for airportName in airports.values {
         prINTln("Airport name: \(airportName)")
     }
     // Airport name: Tokyo