diff --git a/pytchat/processors/speed_calculator.py b/pytchat/processors/speed_calculator.py
index fb01d24..504762a 100644
--- a/pytchat/processors/speed_calculator.py
+++ b/pytchat/processors/speed_calculator.py
@@ -1,5 +1,5 @@
 """
-speedmeter.py
+speed_calculator.py
 チャットの勢いを算出するChatProcessor
 Calculate speed of chat.
 """