diff --git a/DOCS/man/en/mplayer.1 b/DOCS/man/en/mplayer.1
index 990fa2d8e4..af6a14238f 100644
--- a/DOCS/man/en/mplayer.1
+++ b/DOCS/man/en/mplayer.1
@@ -5230,7 +5230,8 @@ try to encode each MB with MV=<0,0> and choose the better one
 this has no effect if mbd=0
 .TP
 .B qprd\ \ \ 
-rate distorted optimal QP for the given lambda of each macroblock
+rate distorted optimal QP for the given lambda of each macroblock, note this
+needs mbd=2
 .TP
 .B last_pred=<0\-99>
 Amount of motion predictors from the previous frame