(detect-coding-with-priority): Add comment before the call of

update-coding-systems-internal.

lisp/international/mule-util.el

@@ -327,6 +327,7 @@ coding systems ordered by priority."
 	 (mapc (function (lambda (x) (set (car x) (cdr x))))
 	       prio-list)
 	 (set-coding-priority (mapcar #'car prio-list))
+	 ;; Changing the binding of a coding category requires this call.
 	 (update-coding-systems-internal)
 	 (detect-coding-region ,from ,to))
      ;; We must restore the internal database.