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[rrdtool.git] / doc / rrdgraph_graph.pod

diff --git a/doc/rrdgraph_graph.pod b/doc/rrdgraph_graph.pod
index 2364f54..bf683ed 100644 (file)
--- a/doc/rrdgraph_graph.pod
+++ b/doc/rrdgraph_graph.pod
@@ -201,10 +201,11 @@ be filled.
 =item B<TICK>B<:>I<vname>B<#>I<rrggbb>[I<aa>][B<:>I<fraction>[B<:>I<legend>]]
 
 Plot a tick mark (a vertical line) for each value of I<vname> that is
-non-zero and not *UNKNOWN*. The I<fraction> argument specifies the
-length of the tick mark as a fraction of the y-axis; the default value
-is 0.1 (10% of the axis). Note that the color specification is not
-optional.
+non-zero and not *UNKNOWN*. The I<fraction> argument specifies the length of
+the tick mark as a fraction of the y-axis; the default value is 0.1 (10% of
+the axis). Note that the color specification is not optional. The TICK marks
+start at y==0 if it is inside the graph. Else they start at the border that
+is closer to 0.
 
 =item B<SHIFT>B<:>I<vname>B<:>I<offset>