diff --git a/k8s/charts/seaweedfs/values.yaml b/k8s/charts/seaweedfs/values.yaml
index bd5f78a18..0f3f94fc2 100644
--- a/k8s/charts/seaweedfs/values.yaml
+++ b/k8s/charts/seaweedfs/values.yaml
@@ -1183,8 +1183,8 @@ allInOne:
     type: "emptyDir"  # Options: "hostPath", "persistentVolumeClaim", "emptyDir", "existingClaim"
     hostPathPrefix: /mnt/data  # Path prefix for hostPath volumes
     claimName: seaweedfs-data-pvc  # Name of the PVC to use (for existingClaim type)
-    size: ""  # Size of the PVC (for persistentVolumeClaim type)
-    storageClass: ""  # Storage class for the PVC
+    size: null  # Size of the PVC (null defaults to 10Gi for persistentVolumeClaim type)
+    storageClass: null  # Storage class for the PVC (null uses cluster default)
     # accessModes for the PVC. Default is ["ReadWriteOnce"].
     # For multi-replica deployments, use ["ReadWriteMany"] with a compatible storage class.
     accessModes: []