diff --git a/API.md b/API.md
index 976f8d8..225a682 100644
--- a/API.md
+++ b/API.md
@@ -6,8 +6,8 @@
 
 ## 认证方式
 使用简单的 Token 认证（实际生产环境应使用 JWT 等更安全的方式）。  
-登录后返回的 Token 需在后续请求中通过 `Authorization` 头携带：  
-`Authorization: Bearer <your_token>`
+登录后返回的 Token 需在后续请求中通过 `Authorization` 头携带：  `Authorization: Bearer <your_token>`
+
 
 ---
 
@@ -19,23 +19,23 @@
 **请求体**:
 ```json
 {
-"username": "string",
-"password": "string"
+    "username": "string",
+    "password": "string"
 }
 ```
 
 **成功响应**:
 ```json
 {
-"success": true,
-"message": "User registered successfully"
+    "success": true,
+    "message": "User registered successfully"
 }
 ```
 **错误响应**:
 ```json
 {
-"success": false,
-"message": "Username already exists"
+    "success": false,
+    "message": "Username already exists"
 }
 ```
 
@@ -48,26 +48,26 @@
 **请求体**:
 ```json
 {
-"username": "string",
-"password": "string"
+    "username": "string",
+    "password": "string"
 }
 ```
 
 **成功响应**:
 ```json
 {
-"success": true,
-"message": "Login successful",
-"token": "string",
-"user_id": "integer",
-"username": "string"
+    "success": true,
+    "message": "Login successful",
+    "token": "string",
+    "user_id": "integer",
+    "username": "string"
 }
 ```
 **错误响应**:
 ```json
 {
-"success": false,
-"message": "Invalid username or password"
+    "success": false,
+    "message": "Invalid username or password"
 }
 ```
 
@@ -130,23 +130,23 @@
 **请求体**:
 ```json
 {
-"message_id": "integer",
-"user_id": "integer"
+    "message_id": "integer",
+    "user_id": "integer"
 }
 ```
 
 **成功响应**:
 ```json
 {
-"success": true,
-"message": "Message recalled successfully"
+    "success": true,
+    "message": "Message recalled successfully"
 }
 ```
 **错误响应**:
 ```json
 {
-"success": false,
-"message": "You can only recall your own messages"
+    "success": false,
+    "message": "You can only recall your own messages"
 }
 ```