diff --git a/.trellis/tasks/04-20-04-20-readme-webview2-note/task.json b/.trellis/tasks/04-20-04-20-readme-webview2-note/task.json
new file mode 100644
index 0000000..e17f134
--- /dev/null
+++ b/.trellis/tasks/04-20-04-20-readme-webview2-note/task.json
@@ -0,0 +1,53 @@
+{
+  "id": "04-20-readme-webview2-note",
+  "name": "04-20-readme-webview2-note",
+  "title": "Add WebView2 runtime note to bilingual README",
+  "description": "Add Windows desktop runtime note to README.md and README_EN.md",
+  "status": "planning",
+  "dev_type": null,
+  "scope": null,
+  "package": null,
+  "priority": "P3",
+  "creator": "OpenCode",
+  "assignee": "OpenCode",
+  "createdAt": "2026-04-20",
+  "completedAt": null,
+  "branch": null,
+  "base_branch": "master",
+  "worktree_path": null,
+  "current_phase": 0,
+  "next_action": [
+    {
+      "phase": 1,
+      "action": "brainstorm"
+    },
+    {
+      "phase": 2,
+      "action": "research"
+    },
+    {
+      "phase": 3,
+      "action": "implement"
+    },
+    {
+      "phase": 4,
+      "action": "check"
+    },
+    {
+      "phase": 5,
+      "action": "update-spec"
+    },
+    {
+      "phase": 6,
+      "action": "record-session"
+    }
+  ],
+  "commit": null,
+  "pr_url": null,
+  "subtasks": [],
+  "children": [],
+  "parent": null,
+  "relatedFiles": [],
+  "notes": "",
+  "meta": {}
+}
\ No newline at end of file
diff --git a/README.md b/README.md
index 2c056ba..249f1aa 100644
--- a/README.md
+++ b/README.md
@@ -87,6 +87,13 @@ Windows 下默认产物路径：
 build/bin/ocswitch-desktop.exe
 ```
 
+提示：
+
+- Windows 11 一般已内置 WebView2 Runtime；主流 Windows 10 设备通常也已经安装。
+- `ocswitch-desktop.exe` 按单文件产物分发，不需要额外同目录依赖文件。
+- 如果桌面应用在 Windows 上无法启动，常见原因之一是系统缺少 WebView2 Runtime；这时请先安装 Microsoft Edge WebView2 Runtime 再重试：
+  https://developer.microsoft.com/microsoft-edge/webview2/
+
 ### 开发模式
 
 如果你想本地调试桌面 GUI：
diff --git a/README_EN.md b/README_EN.md
index d39a23b..5c75478 100644
--- a/README_EN.md
+++ b/README_EN.md
@@ -55,6 +55,13 @@ On Windows, the default output path is:
 build/bin/ocswitch-desktop.exe
 ```
 
+Note:
+
+- Windows 11 generally includes the WebView2 Runtime, and most mainstream Windows 10 devices already have it installed.
+- `ocswitch-desktop.exe` is distributed as a single-file artifact and does not require extra sidecar files in the same directory.
+- If the desktop app fails to start on Windows, one common cause is a missing WebView2 Runtime. Install the Microsoft Edge WebView2 Runtime and try again:
+  https://developer.microsoft.com/microsoft-edge/webview2/
+
 ### Development mode
 
 To run the desktop GUI in local development mode: