diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0649320..1154704 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 ## 0.2.7 2023-10
 
+* [Add plugin `app.appId`](https://github.com/siyuan-note/siyuan/issues/9538)
 * [Add plugin event bus `switch-protyle`](https://github.com/siyuan-note/siyuan/issues/9454)
 
 ## 0.2.6 2023-10-24
diff --git a/src/index.ts b/src/index.ts
index 140860e..ec5da1a 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -253,6 +253,11 @@ export default class PluginSample extends Plugin {
         const dialog = new Dialog({
             title: "Info",
             content: `<div class="b3-dialog__content">
+    <div>appId:</div>
+    <div class="fn__hr"></div>
+    <div class="plugin-sample__time">${this.app.appId}</div>
+    <div class="fn__hr"></div>
+    <div class="fn__hr"></div>
     <div>API demo:</div>
     <div class="fn__hr"></div>
     <div class="plugin-sample__time">System current time: <span id="time"></span></div>