diff --git a/DOCS/man/en/mplayer.1 b/DOCS/man/en/mplayer.1
index b63e55e741..80f16e376e 100644
--- a/DOCS/man/en/mplayer.1
+++ b/DOCS/man/en/mplayer.1
@@ -6775,8 +6775,8 @@ p_mask=1.0 doubles the bits allocated to each intra block.
 .B border_mask=<0.0\-1.0>
 border-processing for MPEG-style encoders.
 Border processing increases the quantizer for macroblocks which are less
-than 1/5th of the frame away from the border of the frame, since they are
-visually less important.
+than 1/5th of the frame width/height away from the frame border,
+since they are often visually less important.
 .
 .TP
 .B naq\ \ \ \