diff --git a/installer/README.md b/installer/README.md
index 17a3b7f00..9f2c74897 100644
--- a/installer/README.md
+++ b/installer/README.md
@@ -17,7 +17,7 @@ chmod +x install_dependencies.sh && . install_dependencies.sh
 ### Set Host IP
 ```bash
 cd ansible
-export HOST_IP=<your_host_ip>
+export HOST_IP=<your_host_ip> #note: make sure host_ip is either public ip or 192.x.x.x series ip.
 ```
 
 ### Run the Ansible Playbook to install Multi-cloud