gbranden pushed a commit to branch master
in repository groff.
commit 86a78b65dd5f87c5dd3f8d95dd64108eac72a856
Author: G. Branden Robinson <[email protected]>
AuthorDate: Mon May 4 14:19:22 2026 -0500
[doc,man]: Update & sync .S register description.
It's not unique to Plan 9 troff.
---
doc/groff.texi.in | 26 ++++++++++++++++++++------
man/groff.7.man | 12 +++++++++---
2 files changed, 29 insertions(+), 9 deletions(-)
diff --git a/doc/groff.texi.in b/doc/groff.texi.in
index ec0b49975..c3fe55e62 100644
--- a/doc/groff.texi.in
+++ b/doc/groff.texi.in
@@ -11420,12 +11420,26 @@ tab stop.
Tab stops are associated with the environment (@pxref{Environments}).
@cindex tab stop settings register (@code{.tabs})
-@cindex @code{.S} register, Plan@tie{}9 name for @code{.tabs}
-@cindex @code{.tabs} register, Plan@tie{}9 name for (@code{.S})
-The read-only register @code{.tabs} contains a string
-representation of the current tab settings suitable for use as an
-argument to the @code{ta} request.@footnote{Plan@tie{}9 @code{troff}
-uses the register @code{.S} for this purpose.}
+@cindex @code{.S} register, other @command{troff}s' name for @code{.tabs}
+@cindex @code{.tabs} register, other @command{troff}s' name for (@code{.S})
+The read-only register
+@code{.tabs}
+contains a string representation of the current tab settings
+suitable for use as an argument to the
+@code{ta}
+request.@footnote{DWB 3.3,
+Plan@tie{}9,
+and Heirloom Doctools
+@command{troff}s @c DWB, Plan 9, Heirloom
+uses the register
+@code{.S}
+for this purpose,
+lack,
+and thus do not report,
+GNU
+@command{troff}'s
+@code{T}
+extension to tab stop syntax.}
@Example
.ds tab-string \n[.tabs]
diff --git a/man/groff.7.man b/man/groff.7.man
index 7c80e5079..314b7d9fd 100644
--- a/man/groff.7.man
+++ b/man/groff.7.man
@@ -7744,11 +7744,17 @@ and
.REG .S
Reserved.
.
-Plan\~9
-.I troff \" Plan 9
-uses this name for a purpose similar to
+DWB 3.3,
+Plan\~9,
+and Heirloom Doctools
+.IR troff s \" DWB, Plan 9, Heirloom
+lack,
+and thus do not report,
GNU
.IR troff 's \" GNU
+.RB \[lq] T \[rq]
+extension to tab stop syntax;
+see
.register .tabs .
.
.TP
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