.B grav
[\-display \fIhost:display.screen\fP] [\-foreground \fIcolor\fP] [\-background \fIcolor\fP] [\-window] [\-root] [\-mono] [\-install] [\-visual \fIvisual\fP] [\-ncolors \fIinteger\fP] [\-delay \fImicroseconds\fP] [\-count \fIinteger\fP] [\-decay] [\-no\-decay] [\-trail] [\-no\-trail]
+[\-fps]
.SH DESCRIPTION
The \fIgrav\fP program draws a simple orbital simulation
.SH OPTIONS
Whether the objects should leave trails behind them (makes it look vaguely
like a cloud-chamber.
+.TP 8
+.B \-fps
+Display the current frame rate and CPU load.
.SH ENVIRONMENT
.PP
.TP 8