diff --git a/wxpy/api/bot.py b/wxpy/api/bot.py
index 4294c80..9411a9f 100644
--- a/wxpy/api/bot.py
+++ b/wxpy/api/bot.py
@@ -282,7 +282,7 @@ def add_friend(self, user, verify_content=''):
         """
         添加用户为好友
 
-        :param user: 用户对象，或 user_name，或用户的微信ID
+        :param user: 用户对象，或 user_name
         :param verify_content: 验证说明信息
         """
 
@@ -302,7 +302,7 @@ def add_mp(self, user):
         """
         添加/关注 公众号
         
-        :param user: 公众号对象，或 user_name, 或公众号的微信ID
+        :param user: 公众号对象，或 user_name
         """
 
         logger.info('{}: adding {}'.format(self, user))
diff --git a/wxpy/api/chats/groups.py b/wxpy/api/chats/groups.py
index 3cce343..4271703 100644
--- a/wxpy/api/chats/groups.py
+++ b/wxpy/api/chats/groups.py
@@ -14,7 +14,7 @@ def __init__(self, group_list=None):
             # 因此加一个保护逻辑: 只返回"包含自己的群"
 
             super(Groups, self).__init__(
-                list(filter(lambda x: x.bot.self in x, group_list))
+                filter(lambda x: x.bot.self in x, group_list)
             )
 
     def search(self, keywords=None, users=None, **attributes):