diff --git a/bin/convert_format.py b/bin/convert_format.py
index 771a71b..bc98e91 100644
--- a/bin/convert_format.py
+++ b/bin/convert_format.py
@@ -1,8 +1,16 @@
 # 2021/11/30
 # bfsujason@163.com
 
-# Usage:
-# python -p xi -s ..\data\split\zh zh -t ..\data\split\en en -a ..\data\zh-en -f intertext
+"""
+Usage:
+
+python bin/convert_format.py \
+  -p mac-dev \
+  -s data/mac/dev/zh zh \
+  -t data/mac/dev/en en \
+  -a data/mac/dev/auto \
+  -f tsv
+"""
 
 import os
 import re