(sort invocation): Clarify how -t works when

a sort key specifies a range of fields.  From Karl O. Pinc.

1 files changed, 3 insertions, 1 deletions

diff --git a/doc/textutils.texi b/doc/textutils.texi
index c48b41f1c..f9baa9b32 100644
--- a/doc/textutils.texi
+++ b/doc/textutils.texi
@@ -2269,7 +2269,9 @@ string between a non-whitespace character and a whitespace character.
 That is, given the input line @w{@samp{ foo bar}}, @code{sort} breaks it
 into fields @w{@samp{ foo}} and @w{@samp{ bar}}.  The field separator is
 not considered to be part of either the field preceding or the field
-following.
+following.  But note that sort fields that extend to the end of the line,
+as @samp{-k 2}, or sort fields consisting of a range, as @samp{-k 2,3},
+retain the field separators present between the endpoints of the range.
 
 @item -T @var{tempdir}
 @opindex -T