diff --git a/driveGnuPlots.pl b/driveGnuPlots.pl
index b2c7807..9d5b90e 100755
--- a/driveGnuPlots.pl
+++ b/driveGnuPlots.pl
@@ -17,6 +17,8 @@ GetOptions(\%options,
            "ylabel=s",
            "y2label=s",
            "title=s",
+           "ymin=f",
+           "ymax=f",
            "y2min=f",
            "y2max=f",
            "y2=i@",