diff --git a/egs/tedlium2/ASR/conformer_ctc3/.train.py.swp b/egs/tedlium2/ASR/conformer_ctc3/.train.py.swp
index e60a017d6..5f4b09dda 100644
Binary files a/egs/tedlium2/ASR/conformer_ctc3/.train.py.swp and b/egs/tedlium2/ASR/conformer_ctc3/.train.py.swp differ
diff --git a/egs/tedlium2/ASR/conformer_ctc3/train.py b/egs/tedlium2/ASR/conformer_ctc3/train.py
index 05c5f1d39..83a716ced 100755
--- a/egs/tedlium2/ASR/conformer_ctc3/train.py
+++ b/egs/tedlium2/ASR/conformer_ctc3/train.py
@@ -138,6 +138,11 @@ def add_model_arguments(parser: argparse.ArgumentParser) -> None:
         type=int,
         default=15,
     )
+    parser.add_argument(
+        "--group-num",
+        type=int,
+        default=0,
+    )
 
 
 def get_parser() -> argparse.ArgumentParser: