diff --git a/driveGnuPlots.pl b/driveGnuPlots.pl
index bc2eb8d..29bb447 100755
--- a/driveGnuPlots.pl
+++ b/driveGnuPlots.pl
@@ -10,22 +10,31 @@ use Thread::Queue;
 
 my $usage = <<OEF;
 Usage: $0 <options>
-  --[no]stream         Do [not] display the data a point at a time, as it comes in
+  --[no]stream         Do [not] display the data a point at a time, as it
+                       comes in
   --[no]lines          Do [not] draw lines to connect consecutive points
+  --[no]points         Do [not] draw points
   --xlabel xxx         Set x-axis label
   --ylabel xxx         Set y-axis label
   --y2label xxx        Set y2-axis label
   --title  xxx         Set the title of the plot
-  --legend xxx         Set the label for a curve plot. Give this option multiple times for multiple curves
+  --legend xxx         Set the label for a curve plot. Give this option multiple
+                       times for multiple curves
   --xlen xxx           Set the size of the x-window to plot
-  --xmin  xxx          Set the range for the x axis. These are ignored in a streaming plot
-  --xmax  xxx          Set the range for the x axis. These are ignored in a streaming plot
+  --xmin  xxx          Set the range for the x axis. These are ignored in a
+                       streaming plot
+  --xmax  xxx          Set the range for the x axis. These are ignored in a
+                       streaming plot
   --ymin  xxx          Set the range for the y axis.
   --ymax  xxx          Set the range for the y axis.
   --y2min xxx          Set the range for the y2 axis.
   --y2max xxx          Set the range for the y2 axis.
-  --y2    xxx          Plot the data with this index on the y2 axis. These are 0-indexed
-  --hardcopy xxx       If not streaming, output to a file specified here. Format inferred from filename
+  --y2    xxx          Plot the data with this index on the y2 axis. These are
+                       0-indexed
+  --hardcopy xxx       If not streaming, output to a file specified here. Format
+                       inferred from filename
+  --dump               Instead of printing to gnuplot, print to STDOUT. For
+                       debugging.
 OEF
 
 # stream in the data by default