diff --git a/Readme.md b/Readme.md
index da65333..758fb3b 100644
--- a/Readme.md
+++ b/Readme.md
@@ -61,10 +61,11 @@ sudo make install
 ```bash
 # build 64bit
 sudo make clean
-./configure --prefix=/opt/riscv 
+# ./configure --prefix=/opt/riscv 
+./configure --prefix=/opt/riscv64 --with-arch=rv64imc_zicsr --with-abi=lp64
 sudo make -j12
 
-# build 64bit and 32bit
+# build 32bit
 sudo make clean
 ./configure --prefix=/opt/riscv --with-arch=rv32gc --with-abi=ilp32d --enable-multilib
 sudo make -j12