diff --git a/README.md b/README.md
index 9b15997..b5d33f7 100644
--- a/README.md
+++ b/README.md
@@ -59,14 +59,16 @@ Whether to enable the Kubernetes web dashboard UI (only accessible on the master
       # Flannel CNI.
       cni: 'flannel'
       cidr: '10.244.0.0/16'
+      #
       # Calico CNI.
       # cni: 'calico'
       # cidr: '192.168.0.0/16'
+      #
       # Weave CNI.
       # cni: 'weave'
       # cidr: '192.168.0.0/16'
-      
-This role currently supports `flannel` (default), `calico` or `weave` for cluster pod networking. Choose one or the other for your cluster; converting between the three is not done automatically and could result in broken networking, and should be done outside of this role.
+
+This role currently supports `flannel` (default), `calico` or `weave` for cluster pod networking. Choose only one for your cluster; converting between them is not done automatically and could result in broken networking; if you need to switch from one to another, it should be done outside of this role.
 
     kubernetes_apiserver_advertise_address: ''
     kubernetes_version_kubeadm: 'stable-{{ kubernetes_version }}'
diff --git a/tasks/master-setup.yml b/tasks/master-setup.yml
index ce1d7c5..fd7666d 100644
--- a/tasks/master-setup.yml
+++ b/tasks/master-setup.yml
@@ -44,15 +44,16 @@
   changed_when: "'created' in calico_result.stdout"
   when: kubernetes_pod_network.cni == 'calico'
 
-- name: "Get K8s version"
+- name: Get Kubernetes version for Weave installation.
   shell: kubectl version | base64 | tr -d '\n'
-  register: k8_version
+  changed_when: false
+  register: kubectl_version
   when: kubernetes_pod_network.cni == 'weave'
 
 - name: Configure Weave networking.
   command: "{{ item }}"
   with_items:
-    - "kubectl apply -f https://cloud.weave.works/k8s/net?k8s-version={{ k8_version.stdout_lines[0] }}"
+    - "kubectl apply -f https://cloud.weave.works/k8s/net?k8s-version={{ kubectl_version.stdout_lines[0] }}"
   register: weave_result
   changed_when: "'created' in weave_result.stdout"
   when: kubernetes_pod_network.cni == 'weave'