diff --git a/pkg/apis/v1/api.pb.go b/pkg/apis/v1/api.pb.go
index d812a5b3..e6f14683 100644
--- a/pkg/apis/v1/api.pb.go
+++ b/pkg/apis/v1/api.pb.go
@@ -9018,7 +9018,7 @@ type BackupCreateRequest struct {
 	BackupObjectType *BackupCreateRequest_BackupObjectType `protobuf:"bytes,17,opt,name=backup_object_type,json=backupObjectType,proto3" json:"backup_object_type,omitempty"`
 	// Skip auto rules for VirtualMachine Backup Object type
 	SkipVmAutoExecRules bool `protobuf:"varint,18,opt,name=skip_vm_auto_exec_rules,json=skipVmAutoExecRules,proto3" json:"skip_vm_auto_exec_rules,omitempty"`
-	// voume snapshot class mapping for csi based backup <provisioner, volumesnapshotclass>
+	// volume snapshot class mapping for csi based backup <provisioner(string), volumesnapshotclass(string)> (optional)
 	VolumeSnapshotClassMapping map[string]string `protobuf:"bytes,19,rep,name=volume_snapshot_class_mapping,json=volumeSnapshotClassMapping,proto3" json:"volume_snapshot_class_mapping,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
 }
 
diff --git a/pkg/apis/v1/api.proto b/pkg/apis/v1/api.proto
index 802e5b74..98820e02 100644
--- a/pkg/apis/v1/api.proto
+++ b/pkg/apis/v1/api.proto
@@ -1625,7 +1625,7 @@ message BackupCreateRequest {
     BackupObjectType backup_object_type = 17;
     // Skip auto rules for VirtualMachine Backup Object type
     bool skip_vm_auto_exec_rules = 18;
-    // voume snapshot class mapping for csi based backup <provisioner, volumesnapshotclass>
+    // volume snapshot class mapping for csi based backup <provisioner(string), volumesnapshotclass(string)> (optional)
     map<string, string> volume_snapshot_class_mapping = 19;
 
     enum BackupType {
diff --git a/pkg/apis/v1/api.swagger.json b/pkg/apis/v1/api.swagger.json
index d37d0668..9bec7365 100644
--- a/pkg/apis/v1/api.swagger.json
+++ b/pkg/apis/v1/api.swagger.json
@@ -2640,7 +2640,7 @@
           "additionalProperties": {
             "type": "string"
           },
-          "title": "voume snapshot class mapping for csi based backup \u003cprovisioner, volumesnapshotclass\u003e"
+          "title": "volume snapshot class mapping for csi based backup \u003cprovisioner(string), volumesnapshotclass(string)\u003e (optional)"
         }
       },
       "title": "Request message structure for backup create"