diff --git a/lisp/international/mule-cmds.el b/lisp/international/mule-cmds.el index fcbf44d9342..6ff2e46b53a 100644 --- a/lisp/international/mule-cmds.el +++ b/lisp/international/mule-cmds.el @@ -309,7 +309,10 @@ systems set by this function will use that type of EOL conversion. This command does not change the default value of terminal coding system for MS-DOS terminal, because DOS terminals only support a single coding system, and Emacs automatically sets the default to that coding system at -startup." +startup. + +Such a coding system that requires automatic detection of text +encoding (e.g. undecided, unix) can't be preferred." (interactive "zPrefer coding system: ") (if (not (and coding-system (coding-system-p coding-system))) (error "Invalid coding system `%s'" coding-system))