diff --git a/ch6-web/ch6-04-validator.md b/ch6-web/ch6-04-validator.md
index bf75e6d..ceaed91 100644
--- a/ch6-web/ch6-04-validator.md
+++ b/ch6-web/ch6-04-validator.md
@@ -2,9 +2,38 @@
 
 社区里曾经有人用这张图来嘲笑 PHP：
 
-![validate 流程](../images/validate.jpg)
+![validate 流程](../images/ch6-04-validate.jpg)
 
 实际上这是一个语言无关的场景，需要进行字段校验的情况有很多，web 系统的 Form/json 提交只是一个典型的例子。我们用 go 来写一个类似上图的校验 demo。然后研究怎么一步步对其进行改进。假设我们的数据已经通过某个 binding 库绑定到了具体的 struct 上。
 
 ```go
-```
\ No newline at end of file
+type RegisterReq struct {
+    Username        string
+    PasswordNew     string
+    PasswordRepeat  string
+    Email           string
+}
+
+func register(req RegisterReq) error{
+    if len(req.Username) > 0 {
+        if len(req.PasswordNew) > 0 && len(req.PasswordRepeat) > 0 {
+            if req.PasswordNew == req.PasswordRepeat {
+                if emailFormatValid(req.Email) {
+                    createUser()
+                    return nil
+                } else {
+                    return errors.New("invalid email")
+                }
+            } else {
+                return errors.New("password and reinput must be the same")
+            }
+        } else {
+            return errors.New("password and password reinput must be longer than 0")
+        }
+    } else {
+        return errors.New("length of username cannot be 0")
+    }
+}
+```
+
+我们在 golang 里成功写出了 hadoken 开路的箭头型代码。。这种代码一般怎么进行优化呢？
diff --git a/images/validate.jpg b/images/ch6-04-validate.jpg
similarity index 100%
rename from images/validate.jpg
rename to images/ch6-04-validate.jpg