diff --git a/superxas_bec/devices/timepix/timepix_fly_client/timepix_fly_backend.py b/superxas_bec/devices/timepix/timepix_fly_client/timepix_fly_backend.py
index b335c13..4af32db 100644
--- a/superxas_bec/devices/timepix/timepix_fly_client/timepix_fly_backend.py
+++ b/superxas_bec/devices/timepix/timepix_fly_client/timepix_fly_backend.py
@@ -305,6 +305,9 @@ class TimepixFlyBackend:
         # TODO
         for cb, kwd in self.callbacks.values():
             try:
+                logger.info(
+                    f"Running callback for startFrame {start_frame} with {len(data_frames)} data frames and endFrame {end_frame}."
+                )
                 cb(start_frame, data_frames, end_frame, **kwd)
             except Exception:
                 content = traceback.format_exc()