diff --git a/source-tw/chapter2/06_Functions.md b/source-tw/chapter2/06_Functions.md
index 6e3c5e5b..f67c6daf 100644
--- a/source-tw/chapter2/06_Functions.md
+++ b/source-tw/chapter2/06_Functions.md
@@ -76,7 +76,7 @@ println(sayHelloAgain("Anna"))
 func halfOpenRangeLength(start: Int, end: Int) -> Int {
     return end - start
 }
-println(halfOpenRangeLength(1, 10))
+println(halfOpenRangeLength(1, end:10))
 // prints "9"
 ```