diff --git a/egs/librispeech/ASR/pruned_transducer_stateless_d2v_v2/.asr_datamodule.py.swp b/egs/librispeech/ASR/pruned_transducer_stateless_d2v_v2/.asr_datamodule.py.swp
new file mode 100644
index 000000000..9fdea7f44
Binary files /dev/null and b/egs/librispeech/ASR/pruned_transducer_stateless_d2v_v2/.asr_datamodule.py.swp differ
diff --git a/egs/librispeech/ASR/pruned_transducer_stateless_d2v_v2/asr_datamodule.py b/egs/librispeech/ASR/pruned_transducer_stateless_d2v_v2/asr_datamodule.py
index b776820b1..3cf4f3ada 100644
--- a/egs/librispeech/ASR/pruned_transducer_stateless_d2v_v2/asr_datamodule.py
+++ b/egs/librispeech/ASR/pruned_transducer_stateless_d2v_v2/asr_datamodule.py
@@ -213,6 +213,12 @@ class LibriSpeechAsrDataModule:
             type=int,
             default=0,
         )
+        
+        group.add_argument(
+            "--prefix",
+            type=str,
+            default='vox',
+        )
 
     def train_dataloaders(
         self,