diff --git a/codearchiver/cli.py b/codearchiver/cli.py
index 2d05cd0..7117ef9 100644
--- a/codearchiver/cli.py
+++ b/codearchiver/cli.py
@@ -204,8 +204,10 @@ def main():
 			finally:
 				os.chdir('..')
 		if args.writeArtefactsFd3:
+			_logger.debug('Listing artefacts on FD 3')
 			with storage.lock():
 				artefacts = storage.list_new_files()
+			_logger.debug(f'Artefacts: {artefacts!r}')
 			with artefactsFd:
 				for filename in artefacts:
 					print(filename, file = artefactsFd)