Upon insertion, the text occupied the range @var{beg}--@var{end} in the
buffer.
-@item (@var{pos} . @var{deleted})
+@item (@var{text} . @var{position})
This kind of element indicates how to reinsert text that was deleted.
-The deleted text itself is the string @var{deleted}. The place to
-reinsert it is @var{pos}.
+The deleted text itself is the string @var{text}. The place to
+reinsert it is @code{(abs @var{position})}.
@item (t @var{high} . @var{low})
This kind of element indicates that an unmodified buffer became
(put-text-property @var{beg} @var{end} @var{property} @var{value})
@end example
+@item @var{position}
+This element indicates where point was at an earlier time.
+Undoing this element sets point to @var{position}.
+
@item nil
This element is a boundary. The elements between two boundaries are
called a @dfn{change group}; normally, each change group corresponds to