diff --git a/Cores-SweRV/demo/Readme.md b/Cores-SweRV/demo/Readme.md
index 63eec52..256e79a 100644
--- a/Cores-SweRV/demo/Readme.md
+++ b/Cores-SweRV/demo/Readme.md
@@ -59,11 +59,14 @@ sudo make install
 * Opetion1 :<https://github.com/riscv-collab/riscv-gnu-toolchain.git>
 
 ```bash
+# build 64bit
 sudo make clean
-./configure --prefix=/opt/riscv # build 64bit
+./configure --prefix=/opt/riscv 
 sudo make -j12
+
+# build 64bit and 32bit
 sudo make clean
-./configure --prefix=/opt/riscv --with-arch=rv32gc --with-abi=ilp32d
+./configure --prefix=/opt/riscv --with-arch=rv32gc --with-abi=ilp32d --enable-multilib
 sudo make -j12
 ```