diff --git a/Concurrency/Concurrency b/Concurrency/Concurrency
index 040d3f1..d12fea2 100644
--- a/Concurrency/Concurrency
+++ b/Concurrency/Concurrency
@@ -8,4 +8,6 @@ golang的并发通过goroutine实现，goroutine是用户态的线程，由go的
 
 golang提供channel用来在多个goroutine之间进行通信。
 
-通过go 关键字来开启一个goroutine
+
+
+只需要在调用函数前加上 go 关键字 即可开启一个goroutine
\ No newline at end of file
diff --git a/Concurrency/Concurrency.go b/Concurrency/Concurrency.go
index 6c0b270..9a76abe 100644
--- a/Concurrency/Concurrency.go
+++ b/Concurrency/Concurrency.go
@@ -5,21 +5,18 @@ import (
 	"time"
 )
 
-func hello() {
-	fmt.Println("hello")
+func hello(i int) {
+	fmt.Println("hello world", i)
 }
 
-// 主goroutine开启,之后所有的子协程都会自行退出
+// 程序启动之后会创建一个主goroutine去执行
 func main() {
-
-	//通过匿名函数开启goroutine
 	for i := 0; i < 10; i++ {
-		go func() {
-			fmt.Println(i)
-		}() //事实上这个函数中的i去找到的是上面这个循环的i，所以当goroutine启动过快有可能在一个循环中找到i
-
-	}
-	fmt.Println("this is main,2")
-	time.Sleep(time.Second)
-
+		go func(i int) {
+			fmt.Println("hello world", i)
+		}(i)
+	} //开启一个单独的goroutine 去执行hello函数（任务）
+	fmt.Println("main")
+	time.Sleep(1 * time.Second)
+	//main函数结束了 由main函数启动的goroutine也都结束了
 }