diff --git a/Lec-1/Note.md b/Lec-1/Note.md
index e69de29..72572c5 100644
--- a/Lec-1/Note.md
+++ b/Lec-1/Note.md
@@ -0,0 +1,2 @@
+- `go build` 
+- `go run`
\ No newline at end of file
diff --git a/Lec-1/main.go b/Lec-1/main.go
index 6687301..1fcc71f 100644
--- a/Lec-1/main.go
+++ b/Lec-1/main.go
@@ -4,6 +4,7 @@ package main
 // 格式化输入输出，提供打印、扫描、格式化字符串等功能
 import (
 	"fmt"
+	"time"
 )
 
 // main 函数是程序的入口点
@@ -13,5 +14,5 @@ func main() {
 	// 赋值
 	s = "Wonder"
 	fmt.Printf("Hello and welcome, %s!\n", s)
-
+	time.Sleep(3 * time.Second)
 }