diff --git a/Cores-SweRV/demo/Readme.md b/Cores-SweRV/demo/Readme.md
index 8efe7aa..6adc437 100644
--- a/Cores-SweRV/demo/Readme.md
+++ b/Cores-SweRV/demo/Readme.md
@@ -8,6 +8,10 @@ This a demo for llvm build and sim with verilator.
 
 This is a demo of jtag simulation by openocd running on verilator.
 
+## install verilator
+
+`sudo apt install verilator`
+
 ## install openocd
 
 ```shell