add documentation for graph-render-mode

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1794 a5681a0c-68f1-0310-ab6d-d61299d08faa

diff --git a/program/src/rrd_tool.c b/program/src/rrd_tool.c
index 23e05c018df33038580f4289f40f4638afee2bc7..6ca537fa852d9cc23cd8d1b9b18eadf6ba973c49 100644 (file)
--- a/program/src/rrd_tool.c
+++ b/program/src/rrd_tool.c
@@ -150,6 +150,7 @@ void PrintUsage(
            "\t\t[-m|--zoom factor]\n"
            "\t\t[-A|--alt-autoscale]\n"
            "\t\t[-M|--alt-autoscale-max]\n"
+           "\t\t[-G|--graph-render-mode {normal,mono}]\n"
            "\t\t[-R|--font-render-mode {normal,light,mono}]\n"
            "\t\t[-B|--font-smoothing-threshold size]\n"
            "\t\t[-T|--tabwidth width]\n"