+.Ss \&PD
+Specify the vertical space to be inserted before each new paragraph.
+.br
+The syntax is as follows:
+.Bd -filled -offset indent
+.Pf \. Sx \&PD
+.Op Cm height
+.Ed
+.Pp
+The
+.Cm height
+argument is a
+.Xr roff 7
+scaling width.
+It defaults to
+.Cm 1v .
+If the unit is omitted,
+.Cm v
+is assumed.
+.Pp
+This macro affects the spacing before any subsequent instances of
+.Sx \&HP ,
+.Sx \&IP ,
+.Sx \&LP ,
+.Sx \&P ,
+.Sx \&PP ,
+.Sx \&SH ,
+.Sx \&SS ,
+and
+.Sx \&TP .