diff --git a/DOCS/mplayer.1 b/DOCS/mplayer.1
index bd13c0d152..f51e6fb0e2 100644
--- a/DOCS/mplayer.1
+++ b/DOCS/mplayer.1
@@ -58,6 +58,9 @@ or speed problems too. So I've decided to write/modify one...
 MPlayer works out-of-the-box, so you generally don't have to mess with
 any options.
 .TP
+.I NOTE
+Every "flag" option has "noflag" pair, e.g. -fs opposite is -nofs
+.TP
 .BI \-vo\ output\ driver
 select output driver