diff --git a/src/dao.py b/src/dao.py
index 466f95e..4f51364 100644
--- a/src/dao.py
+++ b/src/dao.py
@@ -107,7 +107,7 @@ def fetch_all_menu() -> Generator[tuple[str, str, str], None, None]:
         db.close()
 
 
-def fetch_roll_result() -> str|None:
+def fetch_roll_result() -> str | None:
     """
     获取N天前的抽签结果
     :return: 抽签结果
@@ -118,7 +118,7 @@ def fetch_roll_result() -> str|None:
     cursor = db.cursor()
     try:
         cursor.execute("select value from roll_result where datestr=?",
-                       (datestr, ))
+                       (datestr,))
         row = cursor.fetchone()
         if row is not None:
             return row[0]
diff --git a/src/dinner.py b/src/dinner.py
index b81ce4f..0d8adac 100644
--- a/src/dinner.py
+++ b/src/dinner.py
@@ -55,6 +55,7 @@ def vote_reduce(summary: dict[str, float], limit: int = 2) -> tuple[dict[str, fl
     """
     按规则对投票结果进行修饰
     :param summary: 投票汇总结果
+    :param limit: 降低最近N次点餐结果概率
     :return: 投票汇总结果
     """
     last_results = list(fetch_roll_result_list(-1, limit))
diff --git a/src/utils.py b/src/utils.py
index 0b5aca5..6d47a93 100644
--- a/src/utils.py
+++ b/src/utils.py
@@ -3,10 +3,10 @@ from configparser import ConfigParser
 
 from flask import request
 
-
 config = ConfigParser()
 config.read('./config.ini')
 
+
 def is_mobile_request(user_agent: str) -> bool:
     """
     判断是否是移动端
@@ -16,6 +16,7 @@ def is_mobile_request(user_agent: str) -> bool:
     ua_expression = config.get('Settings', 'UA_EXPRESSION')
     return bool(eval(ua_expression, {"user_agent": user_agent, "re": re}))
 
+
 def get_user() -> str:
     """
     根据访问IP决定用户ID