Update kubeadm.md

cloudnativelabs · Aug 10, 2017 · 79a176a · 79a176a
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diff --git a/Documentation/kubeadm.md b/Documentation/kubeadm.md
@@ -2,6 +2,7 @@
 
 Please follow the [steps](https://kubernetes.io/docs/setup/independent/create-cluster-kubeadm/) to install Kubernetes cluster with Kubeadm.
 
+Kube-router relies on kube-controll-manager to allocate pod CIDR for the nodes. So you must use `kubeadm init` with `--pod-network-cidr` flag.
 
 For the step #3 **Installing a pod network** install a kube-router pod network and network policy add-on with the following command: