diff --git a/package.json b/package.json
index 70e94a3..764bd53 100755
--- a/package.json
+++ b/package.json
@@ -222,6 +222,12 @@
 				"command": "office.html.preview",
 				"key": "ctrl+shift+v",
 				"when": "editorTextFocus && editorLangId == html"
+			},
+			{
+				"command": "office.markdown.switch",
+				"key": "ctrl+alt+e",
+				"mac": "ctrl+cmd+e",
+				"when": "editorTextFocus && editorLangId == markdown"
 			}
 		],
 		"menus": {
diff --git a/src/service/markdownService.ts b/src/service/markdownService.ts
index eca1392..319d88a 100644
--- a/src/service/markdownService.ts
+++ b/src/service/markdownService.ts
@@ -206,7 +206,9 @@ export class MarkdownService {
     }
 
     public switchEditor(uri: vscode.Uri) {
-        const type = vscode.window.activeTextEditor ? 'cweijan.markdownViewer' : 'default';
+        const editor = vscode.window.activeTextEditor;
+        if (!uri) uri = editor?.document.uri;
+        const type = editor ? 'cweijan.markdownViewer' : 'default';
         vscode.commands.executeCommand('vscode.openWith', uri, type);
     }