diff --git a/README.md b/README.md
index df990c7..4ae18c1 100644
--- a/README.md
+++ b/README.md
@@ -59,6 +59,11 @@ Apt repository options for Kubernetes installation.
 
 Yum repository options for Kubernetes installation.
 
+    kubernetes_flannel_manifest_file_rbac: https://raw.githubusercontent.com/coreos/flannel/master/Documentation/k8s-manifests/kube-flannel-rbac.yml
+    kubernetes_flannel_manifest_file: https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
+
+Flannel manifest files to apply to the Kubernetes cluster to enable networking. You can copy your own files to your server and apply them instead, if you need to customize the Flannel networking configuration.
+
 ## Dependencies
 
 None.
diff --git a/defaults/main.yml b/defaults/main.yml
index c762218..e79521d 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -28,3 +28,7 @@ kubernetes_apt_repository: "deb http://apt.kubernetes.io/ kubernetes-xenial {{ k
 kubernetes_apt_ignore_key_error: False
 
 kubernetes_yum_arch: x86_64
+
+# Flannel config files.
+kubernetes_flannel_manifest_file_rbac: https://raw.githubusercontent.com/coreos/flannel/master/Documentation/k8s-manifests/kube-flannel-rbac.yml
+kubernetes_flannel_manifest_file: https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
diff --git a/tasks/master-setup.yml b/tasks/master-setup.yml
index 89c1922..416c6c2 100644
--- a/tasks/master-setup.yml
+++ b/tasks/master-setup.yml
@@ -30,8 +30,8 @@
 - name: Configure Flannel networking.
   command: "{{ item }}"
   with_items:
-    - kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/k8s-manifests/kube-flannel-rbac.yml
-    - kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
+    - kubectl apply -f {{ kubernetes_flannel_manifest_file_rbac }}
+    - kubectl apply -f {{ kubernetes_flannel_manifest_file }}
   register: flannel_result
   changed_when: "'created' in flannel_result.stdout"