diff --git a/Build-with-Docker.md b/Build-with-Docker.md
index 29b9d24..3402d28 100644
--- a/Build-with-Docker.md
+++ b/Build-with-Docker.md
@@ -4,6 +4,10 @@
 `cd wownero`
 
 ## Build Docker Image
+`VBoxManage modifyvm default --cpus 2`
+
+`VBoxManage modifyvm default --memory 4096`
+
 `docker-machine start`
 
 `docker-machine env`