-containing (@var{name} . @var{alter}) or ((@var{octave} . @var{name}) . @var{alter}).
- where @var{name} is from 0.. 6 and
-@var{alter} from -4 (double flat) to 4 (double sharp).
+containing (@var{step} . @var{alter}) or ((@var{octave} . @var{step})
+. @var{alter}). where @var{step} is from 0.. 6 and @var{alter} a fraction, denoting
+alteration. For alterations, use symbols, eg.
+@code{keySignature = #`((6 . ,FLAT))}