added --alt-autoscale-min (see --alt-autoscale-max) -- Helge Oldach

[rrdtool.git] / doc / rrdgraph.pod

diff --git a/doc/rrdgraph.pod b/doc/rrdgraph.pod
index b7bf370..9060bd8 100644 (file)
--- a/doc/rrdgraph.pod
+++ b/doc/rrdgraph.pod
@@ -123,6 +123,14 @@ maximum y-axis from the actual minimum and maximum data values. Our example
 would display slightly less than C<260-0.001> to slightly more than
 C<260+0.001> (this feature was contributed by Sasha Mikheev).
 
+[B<-J>|B<--alt-autoscale-min>]
+
+Where C<--alt-autoscale> will modify both the absolute maximum AND minimum
+values, this option will only affect the minimum value. The maximum
+value, if not defined on the command line, will be 0. This option can
+be useful when graphing router traffic when the WAN line uses compression,
+and thus the throughput may be higher than the WAN line speed.
+
 [B<-M>|B<--alt-autoscale-max>]
 
 Where C<--alt-autoscale> will modify both the absolute maximum AND minimum
@@ -191,6 +199,10 @@ placed every I<label factor> lines.  You can specify C<-y none> to
 suppress the grid and labels altogether.  The default for this option is
 to automatically select sensible values.
 
+If you have set --y-grid to 'none' not only the labels get supressed, also
+the space reserved for the labels is removed. You can still add space
+manually if you use the --units-length command to explicitly reserve space.
+
 [B<-Y>|B<--alt-y-grid>]
 
 Place the Y grid dynamically based on the graph's Y range. The algorithm