diff --git a/src/ot/client.ts b/src/ot/client.ts
index ef03979..7978575 100644
--- a/src/ot/client.ts
+++ b/src/ot/client.ts
@@ -1,5 +1,5 @@
 // 客户端实现
-import { SimpleTextOperation as TextOperation } from "./op";
+import { Noop, SimpleTextOperation as TextOperation } from "./op";
 import { getDemoServerInstance } from "./server";
 
 // 直接获取server实例，这里省略了网络过程
@@ -94,7 +94,7 @@ export class Client {
     this.enableSync = enabled;
     // 重新启用同步，继续发送本地操作，发送一个空操作，确保服务端向我们推送最新操作
     if (enabled) {
-      // this.buffer.push(new Noop());
+      this.buffer.push(new Noop());
       this.sendOperationIfNeed();
     }
   }
diff --git a/src/ot/server.ts b/src/ot/server.ts
index 300e8e1..9576ba2 100644
--- a/src/ot/server.ts
+++ b/src/ot/server.ts
@@ -17,7 +17,7 @@ class Server {
 
   // 每当从客户端接收到操作时调用此方法
   receiveOperation(client: Client, revision: number, operation: TextOperation) {
-    console.log("server", "received operation", revision, operation);
+    console.log("server", "received operation from", client.name, revision, operation);
 
     if (revision < 0 || this.operations.length < revision) {
       throw new Error("operation revision not in history");