gbranden pushed a commit to branch master
in repository groff.
commit fa23d9b17ccc6a1016481bc91fe93e5f2f08fbe3
Author: G. Branden Robinson <g.branden.robin...@gmail.com>
AuthorDate: Fri Jul 18 10:10:29 2025 -0500
groff_diff(7): Annotate historical oddity.
---
man/groff_diff.7.man | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/man/groff_diff.7.man b/man/groff_diff.7.man
index 4fcf5ebdf..13c1a54b3 100644
--- a/man/groff_diff.7.man
+++ b/man/groff_diff.7.man
@@ -5208,6 +5208,11 @@ Interpolate number of hours elapsed since midnight.
.
.
.TP
+.\" The `hp` register was documented in the original 1976 Ossanna troff
+.\" "Nroff/Troff User's Manual" and in the January 1981 "Addendum to
+.\" the Nroff/Troff User's Manual" (presumably by Kernighan), and is
+.\" widely supported by descendants of his device-independent troff, but
+.\" appears to have been overlooked in his 1992 revision of CSTR #54.
.B \[rs]n[hp]
Interpolate horizontal position relative to that at the start of the
input line.
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