DEFVAR_LISP ("quit-flag", &Vquit_flag,
doc: /* Non-nil causes `eval' to abort, unless `inhibit-quit' is non-nil.
-Typing C-g sets `quit-flag' non-nil, regardless of `inhibit-quit'. */);
+If the value is t, that means do an ordinary quit.
+If the value equals `throw-on-input', that means quit by throwing
+to the tag specified in `throw-on-input'; it's for handling `while-no-input'.
+Typing C-g sets `quit-flag' to t, regardless of `inhibit-quit',
+but `inhibit-quit' non-nil prevents anything from taking notice of that. */);
Vquit_flag = Qnil;
DEFVAR_LISP ("inhibit-quit", &Vinhibit_quit,