@item M-x sort-columns
Like @kbd{M-x sort-fields} except that the text within each line
-used for comparison comes from a fixed range of columns. See below
-for an explanation.
+used for comparison comes from a fixed range of columns. With a
+prefix argument, sort in reverse order. See below for more details
+on this command.
@findex reverse-region
@item M-x reverse-region
Reverse the order of the lines in the region. This is useful for
-sorting into descending order by fields or columns, since those sort
+sorting into descending order by fields, since those sort
commands do not have a feature for doing that.
@end table