diff --git a/README.md b/README.md
index 60fd6bdcb..c0d42dec8 100644
--- a/README.md
+++ b/README.md
@@ -166,7 +166,7 @@ docker pull oneflowinc/onediff:20231106
   src/onediff/__init__.py
   ```
 
-- install build package (optional)
+- install build package
   ```bash
   python3 -m pip install build
   ```