diff --git a/examples/customize/build_graph/pipeline/pipeline_with_notifications.py b/examples/customize/build_graph/pipeline/pipeline_with_notifications.py
index 254cde3a..441fa696 100644
--- a/examples/customize/build_graph/pipeline/pipeline_with_notifications.py
+++ b/examples/customize/build_graph/pipeline/pipeline_with_notifications.py
@@ -1,6 +1,7 @@
 """This example demonstrates how to use event callback to receive notifications
 about the pipeline progress.
 """
+
 from __future__ import annotations
 
 import asyncio