diff --git a/README-ja.md b/README-ja.md
index 47aaf16e..c4d66eae 100644
--- a/README-ja.md
+++ b/README-ja.md
@@ -59,7 +59,6 @@ pip install --upgrade -r requirements.txt
 pip install -U -I --no-deps https://github.com/C43H66N12O12S2/stable-diffusion-webui/releases/download/f/xformers-0.0.14.dev0-cp310-cp310-win_amd64.whl
 
 cp .\bitsandbytes_windows\*.dll .\venv\Lib\site-packages\bitsandbytes\
-cp .\bitsandbytes_windows\cextension.py .\venv\Lib\site-packages\bitsandbytes\cextension.py
 cp .\bitsandbytes_windows\main.py .\venv\Lib\site-packages\bitsandbytes\cuda_setup\main.py
 
 accelerate config