diff --git a/README.md b/README.md
index 107752f..8ff43b2 100644
--- a/README.md
+++ b/README.md
@@ -1,28 +1,33 @@
 # Google Chat Notification for GitHub Actions
+
 ![](https://github.com/nakamuraos/google-chat-notifications/workflows/Build/badge.svg)
 
 Sends a Google Chat notification.
 
 This repository is generated by [typescript-action](https://github.com/actions/typescript-action).
 
-![Preview](images/preview.png "Preview")
+![Preview](images/preview.png 'Preview')
 
 ## Usage
+
 ### Parameters
-|Name|Required|Description|
-|:---:|:---:|:---|
-|title|true|Job title. Used for notification titles.|
-|subtitle|false|Job subtitle. Used for notification subtitles. We recommend using `${{ github.event.head_commit.message }}`|
-|webhookUrl|true|Google Chat Webhook URL.|
-|status|true|Job status. Available values are `success`, `failure`, `cancelled`. We recommend using `${{ job.status }}`|
-|threadKey|false|Thread key string. Used for send messages to a specific thread in a space|
+
+|    Name    | Required | Default | Description                                                                                                 |
+| :--------: | :------: | :-----: | :---------------------------------------------------------------------------------------------------------- |
+|   title    |          | "Build" | Job title. Used for notification titles.                                                                    |
+|  subtitle  |          |         | Job subtitle. Used for notification subtitles. We recommend using `${{ github.event.head_commit.message }}` |
+| webhookUrl |    ✅    |         | Google Chat Webhook URL.                                                                                    |
+|   status   |    ✅    |         | Job status. Available values are `success`, `failure`, `cancelled`. We recommend using `${{ job.status }}`  |
+| threadKey  |          |         | Thread key string. Used for send messages to a specific thread in a space                                   |
 
 ### Examples
+
 ```yaml
 - name: Google Chat Notification
   uses: nakamuraos/google-chat-notifications@v3.0.0
   with:
     title: Build
+    subtitle: ${{ github.event.head_commit.message }}
     webhookUrl: ${{ secrets.GOOGLE_CHAT_WEBHOOK }}
     status: ${{ job.status }}
     threadKey: ${{ secrets.GOOGLE_CHAT_THREAD_KEY }}
diff --git a/dist/index.js b/dist/index.js
index 3ab2d19..bf7df18 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -32597,7 +32597,7 @@ function notify(_a) {
                 name: `spaces/${spacesKey}/threads/${threadKey}`,
             };
         }
-        const response = yield axios.default.post(webhookUrl, body);
+        const response = yield axios.default.post(webhookUrl + '&messageReplyOption=REPLY_MESSAGE_FALLBACK_TO_NEW_THREAD', body);
         if (response.status !== 200) {
             throw new Error(`Google Chat notification failed. response status=${response.status}`);
         }
@@ -32652,7 +32652,7 @@ const GoogleChat = __importStar(__nccwpck_require__(5365));
 function run() {
     return __awaiter(this, void 0, void 0, function* () {
         try {
-            const title = core.getInput('title', { required: true });
+            const title = core.getInput('title', { required: false }) || 'Build';
             const subtitle = core.getInput('subtitle', { required: false });
             const webhookUrl = core.getInput('webhookUrl', { required: true });
             const status = JobStatus.parse(core.getInput('status', { required: true }));
diff --git a/src/chat.ts b/src/chat.ts
index 14aeee7..b1b0bcc 100644
--- a/src/chat.ts
+++ b/src/chat.ts
@@ -123,7 +123,10 @@ export async function notify({
     }
   }
 
-  const response = await axios.default.post(webhookUrl, body)
+  const response = await axios.default.post(
+    webhookUrl + '&messageReplyOption=REPLY_MESSAGE_FALLBACK_TO_NEW_THREAD',
+    body,
+  )
   if (response.status !== 200) {
     throw new Error(`Google Chat notification failed. response status=${response.status}`)
   }
diff --git a/src/main.ts b/src/main.ts
index 324dbaa..84f196f 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -4,7 +4,7 @@ import * as GoogleChat from './chat'
 
 async function run() {
   try {
-    const title = core.getInput('title', { required: true })
+    const title = core.getInput('title', { required: false }) || 'Build'
     const subtitle = core.getInput('subtitle', { required: false })
     const webhookUrl = core.getInput('webhookUrl', { required: true })
     const status = JobStatus.parse(core.getInput('status', { required: true }))