diff --git a/README.md b/README.md
index 1d25041..15097c2 100644
--- a/README.md
+++ b/README.md
@@ -162,6 +162,11 @@ sh make-cert.sh $REGISTRY_DOMAIN registry
 
 copy the directory .ca/$REGISTRY_DOMAIN:5003 to /etc/docker/certs.d
 
+```
+sudo mkdir -p /etc/docker/certs.d/
+sudo cp -r .ca/$REGISTRY_DOMAIN:5003 /etc/docker/certs.d/
+```
+
 ### make environment variables
 
 ```