diff --git a/charts/omada-controller/5.1/templates/service.yaml b/charts/omada-controller/5.1/templates/service.yaml
index a22ee1c..265fa2b 100644
--- a/charts/omada-controller/5.1/templates/service.yaml
+++ b/charts/omada-controller/5.1/templates/service.yaml
@@ -5,8 +5,10 @@ metadata:
   name: {{ include "omada-controller.fullname" . }}
   labels:
     {{- include "omada-controller.labels" . | nindent 4 }}
+  {{- with .Values.service.annotations }}
   annotations:
-    metallb.universe.tf/allow-shared-ip: omada
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
 spec:
   type: {{ .Values.service.type }}
   ports:
@@ -47,8 +49,10 @@ metadata:
   name: {{ include "omada-controller.fullname" . }}-udp
   labels:
     {{- include "omada-controller.labels" . | nindent 4 }}
+  {{- with .Values.service.annotations }}
   annotations:
-    metallb.universe.tf/allow-shared-ip: omada
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
 spec:
   type: {{ .Values.service.type }}
   ports:
diff --git a/charts/omada-controller/5.1/values.yaml b/charts/omada-controller/5.1/values.yaml
index 256fb0a..84b82d8 100644
--- a/charts/omada-controller/5.1/values.yaml
+++ b/charts/omada-controller/5.1/values.yaml
@@ -47,6 +47,8 @@ securityContext: {}
 service:
   enabled: true
   type: NodePort
+  annotations:
+    metallb.universe.tf/allow-shared-ip: omada
   manage:
     port: 8088
   managessl: