diff --git a/DOCS/man/en/mplayer.1 b/DOCS/man/en/mplayer.1
index 630926856a..86c5f17fb9 100644
--- a/DOCS/man/en/mplayer.1
+++ b/DOCS/man/en/mplayer.1
@@ -7062,11 +7062,10 @@ This selects the quantizer to use for P-frames.
 I- and B-frames are offset from this value by ip_factor and pb_factor, respectively.
 20\-40 is a useful range (default: 26).
 Lower values result in better fidelity, but higher bitrates.
-Note that quantization in H.264 works differently from MPEG-1/2/4.
+Note that quantization in H.264 works differently from MPEG-1/2/4:
 H.264's quantization parameter (QP) is on a logarithmic scale.
-As an example, the bitrate difference between QP=20 and QP=40
-is about a factor of 10.
-Useful quantizers in H.264 tend to be very large compared to MPEG-1/2/4.
+The mapping is approximately H264QP = 12 + 6*log2(MPEGQP).
+For example, MPEG at QP=2 is equivalent to H.264 at QP=18.
 .
 .TP
 .B pass=<1\-3>