Shorten the description of .sp and move it to roff(7).

If is not a macro but a low-level roff request
and not recommended for use in manual pages.

1 files changed, 10 insertions, 0 deletions

diff --git a/roff.7 b/roff.7
index 172a3166..2cee5e43 100644
--- a/roff.7
+++ b/roff.7
@@ -1544,6 +1544,16 @@ is discouraged.
 Use
 .Xr ln 1
 instead.
+.Ss \&sp
+Break the output line and emit vertical space.
+Its syntax is as follows:
+.Pp
+.D1 Pf \. Cm \&sp Op Ar height
+.Pp
+The argument follows the syntax of
+.Sx Scaling Widths
+and defaults to one blank line
+.Pq Li 1v .
 .Ss \&spacewidth
 Set the space width from the font metrics file.
 This is a Heirloom extension and currently ignored.