-.B \-speed \fIfloat\fP
-Specify the speed of the distortion zone, where 1.0 is kind of slow,
-0.5 is twice as slow and 2.0 is twice as fast.
+.B \-speed \fIint\fP
+Specify the speed at which the distortion zone moves, where 0 is slow,
+higher numbers are faster (10 is pretty fast.)