--- xferstats-2.16/xferstats.8	2013-04-04 10:47:07.647973912 +0200
+++ xferstats-2.16/xferstats.8.new	2013-04-04 10:46:28.000000000 +0200
@@ -145,6 +145,9 @@
 When enabled, xferstats will generate a report listing traffic by month
 (January, February, etc.)
 .TP
+.B S
+When enabled, xferstats will generate a report listing traffic by file size
+.TP
 .B w
 When enabled, xferstats will generate a report listing traffic by day of the
 week (Monday, Tuesday, etc.)