diff --git a/content/en/documentation/content-management/shortcodes/extended/timeline/index.md b/content/en/documentation/content-management/shortcodes/extended/timeline/index.md
index 9c1e7ab..9c21e94 100644
--- a/content/en/documentation/content-management/shortcodes/extended/timeline/index.md
+++ b/content/en/documentation/content-management/shortcodes/extended/timeline/index.md
@@ -209,7 +209,7 @@ events:
 
 {{< details "View source" false true >}}
 
-```markdown
+```markdown {data-open=true}
 {?{}{?{}< timeline reverse=true >}}
 events:
   - timestamp: 2021-12-18T16:15:22+08:00