diff --git a/README.md b/README.md
index e93d6b2..a39be0c 100644
--- a/README.md
+++ b/README.md
@@ -31,6 +31,10 @@ Whether the particular server will serve as a Kubernetes `master` (default) or `
 
 Extra args to pass to `kubelet` during startup. E.g. to allow `kubelet` to start up even if there is swap is enabled on your server, set this to: `"--fail-swap-on=false"`. Or to specify the node-ip advertised by `kubelet`, set this to `"--node-ip={{ ansible_host }}"`.
 
+    kubernetes_kubeadm_init_extra_opts: ""
+
+Extra args to pass to `kubeadm init` during K8s control plane initialization. E.g. to specify extra Subject Alternative Names for API server certificate, set this to: `"--apiserver-cert-extra-sans my-custom.host"`
+
     kubernetes_allow_pods_on_master: True
 
 Whether to remove the taint that denies pods from being deployed to the Kubernetes master. If you have a single-node cluster, this should definitely be `True`. Otherwise, set to `False` if you want a dedicated Kubernetes master which doesn't run any other pods.
diff --git a/defaults/main.yml b/defaults/main.yml
index cd59427..d11ef3b 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -12,8 +12,7 @@ kubernetes_packages:
 kubernetes_role: master
 
 kubernetes_kubelet_extra_args: ""
-# Any additional options for kubeadm init
-kubeadm_init_opts: ""
+kubernetes_kubeadm_init_extra_opts: ""
 
 kubernetes_allow_pods_on_master: True
 kubernetes_enable_web_ui: True