-To obtain the proper effect, either the terminal must be set for 9600
-baud or the
-.Fl d
-option must be used to specify a delay, in milliseconds, between each
-update.
-A reasonable delay is 120; the default is 0.
+.Bl -tag -width Ds
+.It Fl d
+Delay between updates (in milliseconds).
+If the terminal is faster than 9600 baud, must be set to non-zero to
+obtain a proper rain effect.
+The default is 120.
+.El