diff --git a/README.md b/README.md
index 6402161..8633be3 100644
--- a/README.md
+++ b/README.md
@@ -73,13 +73,8 @@ $ go get github.com/Tinywan/golang-tutorial
 ###  34 - 反射  
 ###  35 - 读文件  
 
-## 官方文档  
+## 其他文档  
 
 * [如何编写Go代码](/docs/how_to_write_go_code.md)  
-
-###### HELP  
 * [原文](https://golangbot.com/)  
-* [译者一](http://blog.csdn.net/u011304970/article/details/74797939)  
-* [译者二](https://www.studygolang.com/gctt/Noluye)  
 
-本文由 [GCTT](https://github.com/studygolang/GCTT) 原创翻译，[Go语言中文网](https://studygolang.com/)首发。
\ No newline at end of file
diff --git a/demo/point/map01.go b/demo/point/map01.go
index 1650646..811d9a7 100644
--- a/demo/point/map01.go
+++ b/demo/point/map01.go
@@ -1,15 +1,24 @@
 package main
 
 import (
+	"time"
 	"fmt"
 )
 
-func main(){
+func main() {
 	// map[KeyType]ValueType  集合类型
-	var personSalary map[string]int 
+	var personSalary map[string]int
 	// go的三个引用类型 map slice chan
 	if personSalary == nil {
 		fmt.Println("map is nil. Going to make one.")
 		personSalary = make(map[string]int)
+		fmt.Printf(format string, a ...interface{})
+		time.Microsecond
+		fmt.Printf(format string, a ...interface{})
+		fmt.Print(a ...interface{})
+		time.Millisecond();
+		fmt.Print(a)
+		fmt.Println(a)
+		fmt.Printf(format, a)
 	}
-}
\ No newline at end of file
+}
diff --git a/demo/point/map02.go b/demo/point/map02.go
index d40be64..718707b 100644
--- a/demo/point/map02.go
+++ b/demo/point/map02.go
@@ -33,6 +33,7 @@ func main(){
 	}else{
 		fmt.Println(newEmp,"not found")
 	}
+	
 	fmt.Println("----------------遍历 map 中所有的元素---------------------")
 	for key,value := range personSalary {
 		fmt.Printf("personSalary[%s] = %d \n",key,value)