Signed-off-by: Linjie Fu <>
 doc/encoders.texi | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/doc/encoders.texi b/doc/encoders.texi
index eefd124751..2e54dcc15f 100644
--- a/doc/encoders.texi
+++ b/doc/encoders.texi
@@ -2899,6 +2899,13 @@ will refer only to P- or I-frames.  When set to greater 
values multiple layers
 of B-frames will be present, frames in each layer only referring to frames in
 higher layers.
+@item trellis
+Trellis quantization can improve data compression in DCT-based encoding 
+It reduces the size of some DCT coefficients while recovering others to take 
+place. This process can increase quality by effectively finding the optimal
+quantization for each block to maximize the PSNR relative to bitrate.
+Set to off/I/P/B to disable or enable trellis quantization for I/P/B frames.
 @item rc_mode
 Set the rate control mode to use.  A given driver may only support a subset of

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