diff --git a/README.md b/README.md
index 1fa84ba..1c72ab1 100644
--- a/README.md
+++ b/README.md
@@ -813,6 +813,7 @@ function main() {
   request.setAlert(alert);
   request.setThreadid("threadID");
   request.setContentavailable(false);
+  request.setMutablecontent(false);
   client.send(request, function (err, response) {
     if(err) {
       console.log(err);
diff --git a/rpc/example/node/client.js b/rpc/example/node/client.js
index f6f16e8..e487b2d 100644
--- a/rpc/example/node/client.js
+++ b/rpc/example/node/client.js
@@ -19,6 +19,7 @@ function main() {
   request.setAlert(alert);
   request.setThreadid("threadID");
   request.setContentavailable(false);
+  request.setMutablecontent(false);
   client.send(request, function (err, response) {
     if(err) {
       console.log(err);
diff --git a/rpc/example/node/gorush_pb.js b/rpc/example/node/gorush_pb.js
index 7a05ae2..a29e726 100644
--- a/rpc/example/node/gorush_pb.js
+++ b/rpc/example/node/gorush_pb.js
@@ -501,7 +501,8 @@ proto.proto.NotificationRequest.toObject = function(includeInstance, msg) {
     alert: (f = msg.getAlert()) && proto.proto.Alert.toObject(includeInstance, f),
     sound: jspb.Message.getFieldWithDefault(msg, 10, ""),
     contentavailable: jspb.Message.getFieldWithDefault(msg, 11, false),
-    threadid: jspb.Message.getFieldWithDefault(msg, 12, "")
+    threadid: jspb.Message.getFieldWithDefault(msg, 12, ""),
+    mutablecontent: jspb.Message.getFieldWithDefault(msg, 13, false)
   };
 
   if (includeInstance) {
@@ -587,6 +588,10 @@ proto.proto.NotificationRequest.deserializeBinaryFromReader = function(msg, read
       var value = /** @type {string} */ (reader.readString());
       msg.setThreadid(value);
       break;
+    case 13:
+      var value = /** @type {boolean} */ (reader.readBool());
+      msg.setMutablecontent(value);
+      break;
     default:
       reader.skipField();
       break;
@@ -700,6 +705,13 @@ proto.proto.NotificationRequest.serializeBinaryToWriter = function(message, writ
       f
     );
   }
+  f = message.getMutablecontent();
+  if (f) {
+    writer.writeBool(
+      13,
+      f
+    );
+  }
 };
 
 
@@ -916,6 +928,23 @@ proto.proto.NotificationRequest.prototype.setThreadid = function(value) {
 };
 
 
+/**
+ * optional bool mutableContent = 13;
+ * Note that Boolean fields may be set to 0/1 when serialized from a Java server.
+ * You should avoid comparisons like {@code val === true/false} in those cases.
+ * @return {boolean}
+ */
+proto.proto.NotificationRequest.prototype.getMutablecontent = function() {
+  return /** @type {boolean} */ (jspb.Message.getFieldWithDefault(this, 13, false));
+};
+
+
+/** @param {boolean} value */
+proto.proto.NotificationRequest.prototype.setMutablecontent = function(value) {
+  jspb.Message.setField(this, 13, value);
+};
+
+
 
 /**
  * Generated by JsPbCodeGenerator.
diff --git a/rpc/proto/gorush.pb.go b/rpc/proto/gorush.pb.go
index e052e4a..9eec24a 100644
--- a/rpc/proto/gorush.pb.go
+++ b/rpc/proto/gorush.pb.go
@@ -163,6 +163,7 @@ type NotificationRequest struct {
 	Sound            string   `protobuf:"bytes,10,opt,name=sound" json:"sound,omitempty"`
 	ContentAvailable bool     `protobuf:"varint,11,opt,name=contentAvailable" json:"contentAvailable,omitempty"`
 	ThreadID         string   `protobuf:"bytes,12,opt,name=threadID" json:"threadID,omitempty"`
+	MutableContent   bool     `protobuf:"varint,13,opt,name=mutableContent" json:"mutableContent,omitempty"`
 }
 
 func (m *NotificationRequest) Reset()                    { *m = NotificationRequest{} }
@@ -254,6 +255,13 @@ func (m *NotificationRequest) GetThreadID() string {
 	return ""
 }
 
+func (m *NotificationRequest) GetMutableContent() bool {
+	if m != nil {
+		return m.MutableContent
+	}
+	return false
+}
+
 type NotificationReply struct {
 	Success bool  `protobuf:"varint,1,opt,name=success" json:"success,omitempty"`
 	Counts  int32 `protobuf:"varint,2,opt,name=counts" json:"counts,omitempty"`
@@ -458,40 +466,41 @@ var _Health_serviceDesc = grpc.ServiceDesc{
 func init() { proto1.RegisterFile("gorush.proto", fileDescriptor0) }
 
 var fileDescriptor0 = []byte{
-	// 546 bytes of a gzipped FileDescriptorProto
+	// 562 bytes of a gzipped FileDescriptorProto
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+	0x35, 0x19, 0x95, 0xf7, 0x9f, 0x58, 0xd1, 0x11, 0x3d, 0x19, 0xcb, 0xe4, 0x3e, 0x38, 0xb3, 0x9d,
+	0x9c, 0x64, 0x72, 0x05, 0x3e, 0xca, 0x26, 0xaf, 0x4e, 0x3d, 0xc5, 0x75, 0x1a, 0xfd, 0xff, 0x95,
+	0xab, 0x36, 0x86, 0xde, 0xfe, 0x0e, 0x00, 0x00, 0xff, 0xff, 0xc3, 0xb1, 0x58, 0xde, 0x64, 0x04,
 	0x00, 0x00,
 }
diff --git a/rpc/proto/gorush.proto b/rpc/proto/gorush.proto
index 0847f49..a85dce0 100644
--- a/rpc/proto/gorush.proto
+++ b/rpc/proto/gorush.proto
@@ -28,6 +28,7 @@ message NotificationRequest {
   string sound = 10;
   bool contentAvailable = 11;
   string threadID = 12;
+  bool mutableContent = 13;
 }
 
 message NotificationReply {
diff --git a/rpc/server.go b/rpc/server.go
index a43b876..b958de6 100644
--- a/rpc/server.go
+++ b/rpc/server.go
@@ -60,6 +60,7 @@ func (s *Server) Send(ctx context.Context, in *proto.NotificationRequest) (*prot
 		Sound:            in.Sound,
 		ContentAvailable: in.ContentAvailable,
 		ThreadID:         in.ThreadID,
+		MutableContent:   in.MutableContent,
 	}
 
 	if badge > 0 {