diff --git a/icefall/rnn_lm/train.py b/icefall/rnn_lm/train.py
index 91df4f921..0f0887859 100755
--- a/icefall/rnn_lm/train.py
+++ b/icefall/rnn_lm/train.py
@@ -22,6 +22,7 @@ Usage:
         --world-size 2 \
         --num-epochs 1 \
         --use-fp16 0 \
+        --tie-weights 0 \
         --embedding-dim 800 \
         --hidden-dim 200 \
         --num-layers 2 \