Update docs to reflect new extra_args

README.md

@@ -244,6 +244,8 @@ services:
 ```
 This will add/append `--cluster-name=mycluster` to the container list of arguments.
 
+As of `v0.1.3-rc2` using `extra_args` will add new arguments and **override** existing defaults. For example, if you need to modify the default admission controllers list, you need to change the default list and add apply it using `extra_args`.
+
 RKE also supports additional volume binds:
 
 ```yaml

cluster.yml

@@ -45,6 +45,8 @@ services:
   kube-api:
     service_cluster_ip_range: 10.233.0.0/18
     pod_security_policy: false
+    # add additional arguments to the kubernetes component
+    # Note that this WILL OVERRIDE existing defaults
     extra_args:
       v: 4
   kube-controller: