full_range_seasonal.gnuplot: add a note about xtics placement

diff --git a/full_range_seasonal.gnuplot b/full_range_seasonal.gnuplot
index f92cf07..72fc7a6 100755 (executable)
--- a/full_range_seasonal.gnuplot
+++ b/full_range_seasonal.gnuplot
@@ -94,6 +94,9 @@ set yrange [ymin:ymax]
 x_samples = seasons_between_dates(xmin, xmax) + 1
 set samples x_samples, 100
 
+# NOTE that the ticks will be placed at the beginning of months regardless of
+# the day of the month of xmin. See:
+# https://stackoverflow.com/questions/42212039/gnuplot-xtic-labels-mispositioning-with-dates
 set xtics xmin,three_months
 
 set terminal qt 0