diff --git a/README.md b/README.md
index 3a065798b24be74e7aa0311e4f0a4418917a8fc0..ee251b6b5635b21d24d6b9989d7b7f22f750c684 100644
--- a/README.md
+++ b/README.md
@@ -16,6 +16,8 @@ pycuda, skcuda #if you use GPU for preparing Ajb
 This is to calculate energy dnsity on Carbon and Hydrogen atom of CH4 with grid settings:
 Legendre quadrature (200 radial points) and Lebedev quadrature (noted as 031, 350 angular points).
 
-
+```shell
+# cd ch4_200_031/
+```