diff --git a/bundle/bundle--org.el b/bundle/bundle--org.el
index 3e517517..baa95a2f 100644
--- a/bundle/bundle--org.el
+++ b/bundle/bundle--org.el
@@ -113,7 +113,15 @@
      (shell . t)
      (plantuml . t)
      (typescript . t)
-     (http . t))))
+     (http . t)))
+  (defun me/write-readme-md-on-save ()
+    ;; when README.org, also write README.md on save
+    (when (string-match "README" (buffer-file-name))
+      (make-local-variable 'after-save-hook)
+      (add-hook 'after-save-hook
+                (lambda () (let ((outfile (org-export-output-file-name ".md")))
+                        (org-export-to-file 'md outfile))))))
+  (add-hook 'org-mode-hook 'me/write-readme-md-on-save))
 
 (use-package org-roam
   :init