[groff] 02/10: doc/groff.texi (Page Motions): Add CSTR#54 errata.

[G. Branden Robinson]

gbranden pushed a commit to branch master
in repository groff.

commit be0bd23b1b9170ca31dec4e151a65cf2c333fe6b
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
AuthorDate: Thu May 20 19:09:10 2021 +1000

    doc/groff.texi (Page Motions): Add CSTR#54 errata.
    
    Thanks to Dave Kemper for noting these in Savannah #60602.
---
 doc/groff.texi | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/doc/groff.texi b/doc/groff.texi
index 7e36f83..9ba3dcb 100644
--- a/doc/groff.texi
+++ b/doc/groff.texi
@@ -12447,16 +12447,22 @@ example, consider a page bottom trap macro that 
prints a marker in the
 margin to indicate continuation of a footnote or something similar.
 @endDefesc
 
-There are some special-case escapes for vertical motion.
+@cindex CSTR@tie{}#54 errata
+There are some special-case escapes for vertical motion.  They were
+incorrectly documented in the @acronym{AT&T} @code{troff} manual as
+causing vertical motions in @samp{m} units, rather than @samp{v}.
 
+@cindex CSTR@tie{}#54 erratum, @code{\r} escape
 @Defesc {\\r, , , }
 Move upwards@tie{}1@dmn{v}.
 @endDefesc
 
+@cindex CSTR@tie{}#54 erratum, @code{\u} escape
 @Defesc {\\u, , , }
 Move upwards@tie{}.5@dmn{v}.
 @endDefesc
 
+@cindex CSTR@tie{}#54 erratum, @code{\d} escape
 @Defesc {\\d, , , }
 Move down@tie{}.5@dmn{v}.
 @endDefesc