diff --git a/README.md b/README.md
index e8057cf..e60adc3 100644
--- a/README.md
+++ b/README.md
@@ -56,6 +56,7 @@ while chat.is_alive():
 ### asyncio context:
 ```python
 from pytchat import LiveChatAsync
+from concurrent.futures import CancelledError
 import asyncio
 
 async def main():
diff --git a/pytchat/__init__.py b/pytchat/__init__.py
index 92ce6f7..c9d3131 100644
--- a/pytchat/__init__.py
+++ b/pytchat/__init__.py
@@ -2,7 +2,7 @@
 pytchat is a python library for fetching youtube live chat without using yt api, Selenium, or BeautifulSoup.
 """
 __copyright__    = 'Copyright (C) 2019 taizan-hokuto'
-__version__      = '0.0.4.1'
+__version__      = '0.0.4.2'
 __license__      = 'MIT'
 __author__       = 'taizan-hokuto'
 __author_email__ = '55448286+taizan-hokuto@users.noreply.github.com'
diff --git a/pytchat/processors/combinator.py b/pytchat/processors/combinator.py
index 1b76df5..c3a81b7 100644
--- a/pytchat/processors/combinator.py
+++ b/pytchat/processors/combinator.py
@@ -7,7 +7,7 @@ class Combinator(ChatProcessor):
 
     For example:
         [constructor]
-        chat = LiveChat("video_id", processor = ( Processor1(), Processor2(), Processor3() )
+        chat = LiveChat("video_id", processor = ( Processor1(), Processor2(), Processor3() ) )
         
         [receive return values]
         ret1, ret2, ret3 = chat.get()
@@ -33,7 +33,7 @@ class Combinator(ChatProcessor):
         -------
             Tuple of chat data processed by each chat processor.
         '''
-        return tuple([processor.process(chat_components)
-            for processor in self.processors])
+        return tuple(processor.process(chat_components)
+            for processor in self.processors)