diff --git a/DOCS/en/mplayer.1 b/DOCS/en/mplayer.1
index 07312ad13d..23117b49a0 100644
--- a/DOCS/en/mplayer.1
+++ b/DOCS/en/mplayer.1
@@ -379,6 +379,11 @@ video codec.
 With this option MPlayer will also ignore frame duration when playing
 only video (you can think of that as infinite fps).
 .TP
+.B \-colorkey <number>
+Changes the colorkey to an RGB value of your choice.
+0x000000 is black and 0xffffff is white.
+Only supported by the xmga, xvidix and xover video out drivers.
+.TP
 .B \-edl <filename>
 Enables edit decision list (EDL) actions during playback.
 Video will be skipped over and audio will be muted and unmuted according to