diff --git a/docs/admin/kubeadm.md b/docs/admin/kubeadm.md
index a43beec497..24f39217f0 100644
--- a/docs/admin/kubeadm.md
+++ b/docs/admin/kubeadm.md
@@ -258,6 +258,8 @@ These environment variables are a short-term solution, eventually they will be i
 | `KUBE_ETCD_IMAGE` | `gcr.io/google_containers/etcd-<arch>:2.2.5` | The etcd container image to use. |
 | `KUBE_REPO_PREFIX` | `gcr.io/google_containers` | The image prefix for all images that are used. |
 
+If you want to use kubeadm with an http proxy, you may need to configure it to support http_proxy, https_proxy, or no_proxy.
+
 ## Releases and release notes
 
 If you already have kubeadm installed and want to upgrade, run `apt-get update && apt-get upgrade` or `yum update` to get the latest version of kubeadm.