diff --git a/README.md b/README.md
index 102599d..dfdf9e0 100644
--- a/README.md
+++ b/README.md
@@ -29,6 +29,8 @@ Longhorn is 100% open source software. Project source code is spread across a nu
 1.  Docker v1.13+
 2.  Kubernetes v1.8+
 3.  Make sure open-iscsi has been installed in all nodes of the Kubernetes cluster. For GKE, recommended Ubuntu as guest OS image since it contains open-iscsi already.
+    1. For Debian/Ubuntu, use `apt-get install open-iscsi` to install.
+    2. For RHEL/CentOS, use `yum install iscsi-initiator-utils` to install.
 
 ## Kubernetes driver Requirements