diff --git a/lisp/mail/rmailedit.el b/lisp/mail/rmailedit.el
index 80cc7c4578b..d456c6c1a6f 100644
--- a/lisp/mail/rmailedit.el
+++ b/lisp/mail/rmailedit.el
@@ -100,9 +100,10 @@ This function runs the hooks `text-mode-hook' and `rmail-edit-mode-hook'.
   (setq rmail-old-headers (rmail-edit-headers-alist t))
   (setq buffer-read-only nil)
   (setq buffer-undo-list nil)
-  ;; FIXME whether the buffer is initially marked as modified or not
+  ;; Whether the buffer is initially marked as modified or not
   ;; depends on whether or not the underlying rmail buffer was so marked.
-  ;; Seems poor.
+  ;; Given the way this works, it has to.
+  ;; If you kill the edit buffer, you've killed your rmail buffer.
   (force-mode-line-update)
   (if (and (eq (key-binding "\C-c\C-c") 'rmail-cease-edit)
 	   (eq (key-binding "\C-c\C-]") 'rmail-abort-edit))