[README] fixed CLI orders

Author: bowwang

README.md

@@ -32,8 +32,13 @@ The new instructions depend on the local changes in both **LLVM** and **riscv-op
 Run the following from the repository root:
 
 ```bash
+# set env properly
+source util/iis-env.sh
+# update opcodes
 make init
+# clone customed LLVM
 make sw/toolchain/llvm-project
+# build LLVM
 make tc-llvm
 ```
 
@@ -43,12 +48,6 @@ The local LLVM toolchain will be installed to:
 spatz/build/llvm
 ```
 
-If you use the IIS environment helper, source:
-
-```tcl
-source util/iis-env.sh
-```
-
 ### Added software: hp-dqmatmul
 
 A new software kernel was added for vector dequantized matrix multiplication using the new instructions.