diff --git a/lisp/play/bubbles.el b/lisp/play/bubbles.el
index 125c3db077c..133c6efc0d2 100644
--- a/lisp/play/bubbles.el
+++ b/lisp/play/bubbles.el
@@ -1429,4 +1429,5 @@ Return t if new char is non-empty."
 
 (provide 'bubbles)
 
+;; arch-tag: 2cd7237a-b0ad-400d-a7fd-75f676dceb70
 ;;; bubbles.el ends here