diff --git a/constants.py b/constants.py
index c373ca3..2c76914 100644
--- a/constants.py
+++ b/constants.py
@@ -3,20 +3,20 @@ from enum import IntEnum, unique
 
 @unique
 class ChatType(IntEnum):
-    UnKnown = 0  # 未知, 即未设置
+    # UnKnown = 0  # 未知, 即未设置
     TIGER_BOT = 1  # TigerBot
     CHATGPT = 2  # ChatGPT
     XINGHUO_WEB = 3  # 讯飞星火
-    ChatGLM = 4  # ChatGLM
+    CHATGLM = 4  # ChatGLM
 
     @staticmethod
     def is_in_chat_types(chat_type: int) -> bool:
         if chat_type in [ChatType.TIGER_BOT.value, ChatType.CHATGPT.value,
-                         ChatType.XINGHUO_WEB.value, ChatType.ChatGLM.value]:
+                         ChatType.XINGHUO_WEB.value, ChatType.CHATGLM.value]:
             return True
         return False
 
     @staticmethod
-    def help_hint():
+    def help_hint() -> str:
         return str({member.value: member.name for member in ChatType}).replace('{', '').replace('}', '')