-keys: @code{padding}, @code{space}, @code{minimum-distance}, and
-@code{stretchability}. Three of the four keys have initialized
-default values; these are listed in the @qq{Backend} section of
-the Internals Reference (see @rinternals{StaffGrouper}):
+keys: @code{padding}, @code{basic-distance},
+@code{minimum-distance}, and @code{stretchability}. Three of the
+four keys have initialized default values; these are listed in the
+@qq{Backend} section of the Internals Reference (see
+@rinternals{StaffGrouper}):