diff --git a/docs/source/installation/index.rst b/docs/source/installation/index.rst
index f960033e8..0f846c77c 100644
--- a/docs/source/installation/index.rst
+++ b/docs/source/installation/index.rst
@@ -66,11 +66,8 @@ to install ``lhotse``.
 (3) Download icefall
 --------------------
 
-``icefall`` is a collection of Python scripts, so you don't need to install it
-and we don't provide a ``setup.py`` to install it.
-
-What you need is to download it and set the environment variable ``PYTHONPATH``
-to point to it.
+``icefall`` is a collection of Python scripts; what you need is to download it
+and set the environment variable ``PYTHONPATH`` to point to it.
 
 Assume you want to place ``icefall`` in the folder ``/tmp``. The
 following commands show you how to setup ``icefall``:
diff --git a/egs/librispeech/ASR/conformer_ctc/decode.py b/egs/librispeech/ASR/conformer_ctc/decode.py
index bddb832b0..3b1d34757 100755
--- a/egs/librispeech/ASR/conformer_ctc/decode.py
+++ b/egs/librispeech/ASR/conformer_ctc/decode.py
@@ -385,7 +385,7 @@ def decode_one_batch(
             ans[lm_scale_str] = hyps
     else:
         for lm_scale in lm_scale_list:
-            ans[lm_scale_str] = [[] * lattice.shape[0]]
+            ans[f"{lm_scale}"] = [[] * lattice.shape[0]]
     return ans