diff --git a/lisp/vc/ediff-wind.el b/lisp/vc/ediff-wind.el
index cd10288643d..eb76988293f 100644
--- a/lisp/vc/ediff-wind.el
+++ b/lisp/vc/ediff-wind.el
@@ -556,7 +556,7 @@ into icons, regardless of the window manager."
     (if (and (window-live-p wind-A)
 	     (null use-same-frame) ; implies wind-A is suitable
 	     (null use-same-frame-for-AB))
-	(progn ; bug A on its own
+	(progn ; buf A on its own
 	  ;; buffer buf-A is seen in live wind-A
 	  (select-window wind-A)
 	  (delete-other-windows)