diff --git a/charts/clusternet-agent/Chart.yaml b/charts/clusternet-agent/Chart.yaml
index b54f2ee..e7bd6c0 100644
--- a/charts/clusternet-agent/Chart.yaml
+++ b/charts/clusternet-agent/Chart.yaml
@@ -33,7 +33,7 @@ kubeVersion: ""
 # This is the chart version. This version number should be incremented each time you make changes
 # to the chart and its templates, including the app version.
 # Versions are expected to follow Semantic Versioning (https://semver.org/)
-version: 0.3.0
+version: 0.3.1
 
 # This is the version number of the application being deployed. This version number should be
 # incremented each time you make changes to the application. Versions are not expected to
diff --git a/charts/clusternet-agent/README.md b/charts/clusternet-agent/README.md
index 44200c1..9e73b88 100644
--- a/charts/clusternet-agent/README.md
+++ b/charts/clusternet-agent/README.md
@@ -3,8 +3,8 @@
 ## TL;DR
 
 ```console
-helm repo add clusternet https://clusternet.github.io/charts
-helm install clusternet-agent -n clusternet-system --create-namespace \
+$ helm repo add clusternet https://clusternet.github.io/charts
+$ helm install clusternet-agent -n clusternet-system --create-namespace \
   --set parentURL=PLEASE-CHANGE-ME \
   --set registrationToken=PLEASE-CHANGE-ME \
   clusternet/clusternet-agent
@@ -13,12 +13,23 @@ helm install clusternet-agent -n clusternet-system --create-namespace \
 Please update `PLEASE-CHANGE-ME` to your valid configurations, such as,
 
 ```console
-helm install clusternet-agent -n clusternet-system --create-namespace \
+$ helm install clusternet-agent -n clusternet-system --create-namespace \
   --set parentURL=https://192.168.10.10:6443 \
   --set registrationToken=07401b.f395accd246ae52d \
   clusternet/clusternet-agent
 ```
 
+**Note:** If bootstrapping authentication is **not supported** by the kube-apiserver in parent cluster (like k3s) , i.e. `--enable-bootstrap-token-auth=false` (which defaults to be false), please use serviceaccount token instead.
+
+[Click here to get the serviceaccount token from parent cluster.](../clusternet-hub/README.md#get-serviceaccount-token-from-parent-cluster)
+
+```console
+$ helm install clusternet-agent -n clusternet-system --create-namespace \
+  --set parentURL=https://192.168.10.10:6443 \
+  --set registrationToken=Parent-Cluster-ServiceAccount-Token \
+  clusternet/clusternet-agent
+```
+
 ## Introduction
 
 `clusternet-agent` is responsible for
diff --git a/charts/clusternet-hub/Chart.yaml b/charts/clusternet-hub/Chart.yaml
index 57dbda1..db739d9 100644
--- a/charts/clusternet-hub/Chart.yaml
+++ b/charts/clusternet-hub/Chart.yaml
@@ -31,7 +31,7 @@ kubeVersion: ""
 # This is the chart version. This version number should be incremented each time you make changes
 # to the chart and its templates, including the app version.
 # Versions are expected to follow Semantic Versioning (https://semver.org/)
-version: 0.3.0
+version: 0.3.1
 
 # This is the version number of the application being deployed. This version number should be
 # incremented each time you make changes to the application. Versions are not expected to
diff --git a/charts/clusternet-hub/README.md b/charts/clusternet-hub/README.md
index 68d8fca..9c0aefb 100644
--- a/charts/clusternet-hub/README.md
+++ b/charts/clusternet-hub/README.md
@@ -3,9 +3,30 @@
 ## TL;DR
 
 ```console
-helm repo add clusternet https://clusternet.github.io/charts
-helm install clusternet-hub -n clusternet-system --create-namespace clusternet/clusternet-hub
-kubectl apply -f https://raw.githubusercontent.com/clusternet/clusternet/main/manifests/samples/cluster_bootstrap_token.yaml
+$ helm repo add clusternet https://clusternet.github.io/charts
+$ helm install clusternet-hub -n clusternet-system --create-namespace clusternet/clusternet-hub
+```
+
+### Create Auth Token
+
+- If bootstrapping authentication is supported, i.e. `--enable-bootstrap-token-auth=true` is explicitly set in the kube-apiserver running in parent cluster.
+
+```console
+$ kubectl apply -f https://raw.githubusercontent.com/clusternet/clusternet/main/manifests/samples/cluster_bootstrap_token.yaml
+```
+
+- If bootstrapping authentication is **not supported** by the kube-apiserver in parent cluster (like k3s) , i.e. `--enable-bootstrap-token-auth=false` (which defaults to be false), please use serviceaccount token instead.
+
+```console
+# this will create a serviceaccount token
+$ kubectl apply -f https://raw.githubusercontent.com/clusternet/clusternet/main/manifests/samples/cluster_serviceaccount_token.yaml
+```
+
+### Get ServiceAccount Token from parent cluster
+
+```console
+$ kubectl get secret -n clusternet-system -o=jsonpath='{.items[?(@.metadata.annotations.kubernetes\.io/service-account\.name=="cluster-bootstrap-use")].data.token}' | base64 --decode; echo
+HERE WILL OUTPUTS A LONG STRING. PLEASE REMEMBER THIS.
 ```
 
 ## Introduction