diff --git a/aiogram/utils/chat_action.py b/aiogram/utils/chat_action.py
index 321b181f..411d4a06 100644
--- a/aiogram/utils/chat_action.py
+++ b/aiogram/utils/chat_action.py
@@ -104,7 +104,7 @@ class ChatActionSender:
         """Process initial action.
 
         If there's no initial sleep - skip current step.
-        If initial_sleep shorter or equal to interval - call action once
+        If initial_sleep shorter or equal to interval - call action once.
         Otherwise, start worker and wait for initial sleep.
         """
         if not self.initial_sleep: