diff --git a/light9/run_local.py b/light9/run_local.py
--- a/light9/run_local.py
+++ b/light9/run_local.py
@@ -26,7 +26,7 @@ coloredlogs.install(
     level='DEBUG',
     milliseconds=True,
     datefmt='t=%H:%M:%S',
-    fmt='%(asctime)s.%(msecs)03d %(levelname)1.1s %(name)s %(message)s',
+    fmt='%(asctime)s.%(msecs)03d %(levelname)1.1s [%(filename)s:%(lineno)s] %(name)s %(message)s',
     # try `pdm run humanfriendly --demo`
     field_styles=dict(
         asctime=dict(color=30),