diff --git a/sample.ts b/sample.ts
index a84e11e..25e9356 100644
--- a/sample.ts
+++ b/sample.ts
@@ -1,8 +1,8 @@
-var str = window.prompt('入力してください');
+let str = window.prompt('入力してください');
 showStr(str);
 function showStr(str: string) {
     alert(str);
 }
 function test() {
-
+// do nothing this is simple sample
 }