diff --git a/README.md b/README.md
index f4283b4..229bb17 100644
--- a/README.md
+++ b/README.md
@@ -97,6 +97,24 @@ LoginException 在 accessToken 错误或过期时抛出
                 liveHistoryBulletScreenEntity.getText())
         );
 
+发送一条弹幕到指定直播间
+
+    String username = "yourUsername";
+    String password = "yourPassword";
+    int roomId = 3;
+    
+    BilibiliAPI bilibiliAPI = new BilibiliAPI()
+        .login(username, password);
+    
+    bilibiliAPI.getLiveService()
+        .sendBulletScreen(
+            new BulletScreenEntity(
+                    roomId,
+                    bilibiliAPI.getBilibiliAccount().getUserId(),   //实际上并不需要包含 mid 就可以正常发送弹幕, 但是真实的 Android 客户端确实发送了 mid
+                    "这是自动发送的弹幕"
+            )
+        ).execute();
+
 (如果要调用需要鉴权的 API, 需要先登录)
 
 API 文档
@@ -116,6 +134,8 @@ API 文档
 
 (connect 以及 close 方法都是阻塞的)
 
+使用 .getLiveClient() 前可以先登录也可以不登陆直接用, 如果 API 已经登录, 那么进房数据包中会带有用户ID, 尚不明确有什么作用, 可能与一些统计有关.
+
 (connect 方法运行结束只代表 socket 确实是连上了, 但是服务器还没有响应进房请求数据包)
 
 (当服务器响应进房请求数据包时才代表真的连上了, 此时会有一个连接成功的事件, 见下文)
diff --git a/src/main/java/com/hiczp/bilibili/api/live/entity/BulletScreenEntity.java b/src/main/java/com/hiczp/bilibili/api/live/entity/BulletScreenEntity.java
index d0bf8ed..b20d267 100644
--- a/src/main/java/com/hiczp/bilibili/api/live/entity/BulletScreenEntity.java
+++ b/src/main/java/com/hiczp/bilibili/api/live/entity/BulletScreenEntity.java
@@ -37,6 +37,7 @@ public class BulletScreenEntity {
 
     private String playTime = "0.0";
 
+    //实际上并不需要包含 mid 就可以正常发送弹幕, 但是真实的 Android 客户端确实发送了 mid
     public BulletScreenEntity(long cid, long mid, String message) {
         this.cid = cid;
         this.mid = mid;
diff --git a/src/test/java/com/hiczp/bilibili/api/test/LiveClientTest.java b/src/test/java/com/hiczp/bilibili/api/test/LiveClientTest.java
index 558752e..7b40dd0 100644
--- a/src/test/java/com/hiczp/bilibili/api/test/LiveClientTest.java
+++ b/src/test/java/com/hiczp/bilibili/api/test/LiveClientTest.java
@@ -18,7 +18,7 @@ import java.util.List;
 public class LiveClientTest {
     private static final Logger LOGGER = LoggerFactory.getLogger(LiveClientTest.class);
     private static final BilibiliAPI BILIBILI_API = Config.getBilibiliAPI();
-    private static final int ROOM_ID = 3;
+    private static final long ROOM_ID = 3;
     private static final long TEST_TIME = 70 * 1000;
 
     @Ignore
diff --git a/src/test/java/com/hiczp/bilibili/api/test/RuleSuite.java b/src/test/java/com/hiczp/bilibili/api/test/RuleSuite.java
index dafb353..b2c1677 100644
--- a/src/test/java/com/hiczp/bilibili/api/test/RuleSuite.java
+++ b/src/test/java/com/hiczp/bilibili/api/test/RuleSuite.java
@@ -16,7 +16,8 @@ import java.io.InputStreamReader;
 @Suite.SuiteClasses({
         UserInfoTest.class,
         LiveClientTest.class,
-        SsoTest.class
+        SsoTest.class,
+        SendBulletScreenTest.class
 })
 public class RuleSuite {
     @ClassRule
diff --git a/src/test/java/com/hiczp/bilibili/api/test/SendBulletScreenTest.java b/src/test/java/com/hiczp/bilibili/api/test/SendBulletScreenTest.java
new file mode 100644
index 0000000..746b14f
--- /dev/null
+++ b/src/test/java/com/hiczp/bilibili/api/test/SendBulletScreenTest.java
@@ -0,0 +1,22 @@
+package com.hiczp.bilibili.api.test;
+
+import com.hiczp.bilibili.api.BilibiliAPI;
+import com.hiczp.bilibili.api.live.entity.BulletScreenEntity;
+import org.junit.Test;
+
+public class SendBulletScreenTest {
+    private static final long ROOM_ID = 29434;
+    private static final BilibiliAPI BILIBILI_API = Config.getBilibiliAPI();
+
+    @Test
+    public void sendBulletScreen() throws Exception {
+        BILIBILI_API.getLiveService()
+                .sendBulletScreen(
+                        new BulletScreenEntity(
+                                ROOM_ID,
+                                BILIBILI_API.getBilibiliAccount().getUserId(),
+                                "这是自动发送的弹幕"
+                        )
+                ).execute();
+    }
+}