diff --git a/src/formatters.js b/src/formatters.js
index 5a92935..6302de6 100644
--- a/src/formatters.js
+++ b/src/formatters.js
@@ -295,7 +295,7 @@ const defaultFormatters = {
     });
 
     const openedAt = moment(thread.created_at).format("YYYY-MM-DD HH:mm:ss");
-    const header = `# Modmail thread with ${thread.user_name} (${thread.user_id}) started at ${openedAt}. All times are in UTC+0.`;
+    const header = `# Modmail thread #${thread.thread_number} with ${thread.user_name} (${thread.user_id}) started at ${openedAt}. All times are in UTC+0.`;
 
     const fullResult = header + "\n\n" + lines.join("\n");