diff --git a/ecs/jskult-webapp/src/model/internal/session.py b/ecs/jskult-webapp/src/model/internal/session.py
index 39d319e2..2fce4869 100644
--- a/ecs/jskult-webapp/src/model/internal/session.py
+++ b/ecs/jskult-webapp/src/model/internal/session.py
@@ -29,6 +29,7 @@ class UserSession(DynamoDBTableModel):
         return datetime.datetime.now().timestamp()
 
     @classmethod
+    # FIXME: 20分にしない方がいい。12時間とかでいい
     def new_record_expiration_time(cls, expire=environment.SESSION_EXPIRE_MINUTE):
         last_access_time = datetime.datetime.fromtimestamp(cls.new_last_access_time())
         return (last_access_time + datetime.timedelta(minutes=expire)).timestamp()