diff --git a/Cores-SweRV/demo/Readme.md b/Cores-SweRV/demo/Readme.md
index f8b538b..704aeb6 100644
--- a/Cores-SweRV/demo/Readme.md
+++ b/Cores-SweRV/demo/Readme.md
@@ -34,6 +34,12 @@ sudo make install
 ## build and install riscv tools
 
 * Opetion1 :https://github.com/riscv-collab/riscv-gnu-toolchain.git
+
+```bash
+./configure --prefix=/opt/riscv
+make linux
+```
+
 * Opetion2 :  
 
 ```bash