diff --git a/egs/librispeech/ASR/conformer_mmi/conformer.py b/egs/librispeech/ASR/conformer_mmi/conformer.py
index 53e48eb13..cffe3df28 100644
--- a/egs/librispeech/ASR/conformer_mmi/conformer.py
+++ b/egs/librispeech/ASR/conformer_mmi/conformer.py
@@ -33,7 +33,7 @@ class Conformer(Transformer):
         subsampling_factor (int): subsampling factor of encoder (the convolution layers before transformers)
         d_model (int): attention dimension
         nhead (int): number of head
-        dim_feedforward (int): feedforward dimention
+        dim_feedforward (int): feedforward dimension
         num_encoder_layers (int): number of encoder layers
         num_decoder_layers (int): number of decoder layers
         dropout (float): dropout rate