===================================================================
RCS file: /cvs/mandoc/tbl.7,v
retrieving revision 1.32
retrieving revision 1.34
diff -u -p -r1.32 -r1.34
--- mandoc/tbl.7	2019/02/08 22:51:53	1.32
+++ mandoc/tbl.7	2019/03/02 21:03:02	1.34
@@ -1,7 +1,7 @@
-.\"	$Id: tbl.7,v 1.32 2019/02/08 22:51:53 schwarze Exp $
+.\"	$Id: tbl.7,v 1.34 2019/03/02 21:03:02 schwarze Exp $
 .\"
 .\" Copyright (c) 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
-.\" Copyright (c) 2014, 2015, 2017, 2018 Ingo Schwarze <schwarze@openbsd.org>
+.\" Copyright (c) 2014,2015,2017,2018,2019 Ingo Schwarze <schwarze@openbsd.org>
 .\"
 .\" Permission to use, copy, modify, and distribute this software for any
 .\" purpose with or without fee is hereby granted, provided that the above
@@ -15,7 +15,7 @@
 .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 .\"
-.Dd $Mdocdate: February 8 2019 $
+.Dd $Mdocdate: March 2 2019 $
 .Dt TBL 7
 .Os
 .Sh NAME
@@ -394,8 +394,8 @@ T}::line 5
 These examples were constructed to demonstrate many
 .Nm
 features in a compact way.
-In real manual pages, keep tables as simple as possible:
-Like that, they usually look better, are less fragile, and more portable.
+In real manual pages, keep tables as simple as possible.
+They usually look better, are less fragile, and are more portable.
 .Sh COMPATIBILITY
 The
 .Xr mandoc 1
@@ -438,3 +438,17 @@ reference was written by
 .An Kristaps Dzonsons Aq Mt kristaps@bsd.lv
 and
 .An Ingo Schwarze Aq Mt schwarze@openbsd.org .
+.Sh BUGS
+In
+.Fl T
+.Cm utf8
+output mode, heavy lines are drawn instead of double lines.
+This cannot be improved because the Unicode standard only provides
+an incomplete set of box drawing characters with double lines,
+whereas it provides a full set of box drawing characters
+with heavy lines.
+It is unlikely this can be improved in the future because the box
+drawing characters are already marked in Unicode as characters
+intended only for backward compatibility with legacy systems,
+and their use is not encouraged.
+So it seems unlikely that the missing ones might get added in the future.