diff --git a/DOCS/man/en/mplayer.1 b/DOCS/man/en/mplayer.1
index 212ffcd883..41efc36632 100644
--- a/DOCS/man/en/mplayer.1
+++ b/DOCS/man/en/mplayer.1
@@ -370,6 +370,20 @@ Set movie window alpha.
 .PD 1
 .PP
 .RS
+(The following keys are valid only when using the sdl
+video output driver.)
+.RE
+.PP
+.PD 0
+.RS
+.IPs "c\ \ \ \ "
+Cycle through available fullscreen modes.
+.IPs "n\ \ \ \ "
+Restore original mode.
+.RE
+.PD 1
+.PP
+.RS
 (The following keys are valid if you have a keyboard
 with multimedia keys.)
 .RE