[groff] 05/50: tbl(1): Document `#T` and `T.` registers.

[G. Branden Robinson]

gbranden pushed a commit to branch master
in repository groff.

commit 08d257a5d5a67f05b8a75a5896c5e4b74f27bc60
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
AuthorDate: Mon May 16 19:50:30 2022 -0500

    tbl(1): Document `#T` and `T.` registers.
    
    * src/preproc/tbl/tbl.1.man (Miscellaneous): Document GNU tbl's use of
      `#T` and `T.` registers.
---
 ChangeLog                 |  5 +++++
 src/preproc/tbl/tbl.1.man | 10 ++++++++++
 2 files changed, 15 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index 47a3f7e7..83d321c1 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2022-05-16  G. Branden Robinson <g.branden.robinson@gmail.com>
+
+       * src/preproc/tbl/tbl.1.man (Miscellaneous): Document GNU tbl's
+       use of `#T` and `T.` registers.
+
 2022-05-15  G. Branden Robinson <g.branden.robinson@gmail.com>
 
        * src/roff/troff/input.cpp (read_color_draw_node): Tweak
diff --git a/src/preproc/tbl/tbl.1.man b/src/preproc/tbl/tbl.1.man
index 8ca45717..bdeb4f49 100644
--- a/src/preproc/tbl/tbl.1.man
+++ b/src/preproc/tbl/tbl.1.man
@@ -1264,6 +1264,16 @@ macro named
 .B TE
 can make use of it.
 .
+.B T.\&
+is a Boolean-valued register indicating whether the bottom of the table
+is being processed.
+.
+The
+.B #T
+register marks the top of the table.
+.
+Avoid using these names for any other purpose.
+.
 .
 .P
 .I @g@tbl