Update README.md

README.md

@@ -58,8 +58,8 @@ git clone -b v1.0.8 https://github.com/Dao-AILab/flash-attention
 cd flash-attention && pip install .
 # 下方安装可选，安装可能比较缓慢。
 # Below are optional. Installing them might be slow.
-pip install csrc/layer_norm
-pip install csrc/rotary
+# pip install csrc/layer_norm
+# pip install csrc/rotary
 ```
 
 ## 快速使用（Quickstart）