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diff --git a/doc/scaler.texi b/doc/scaler.texi
index 0921551a5a..08d90bcc81 100644
--- a/doc/scaler.texi
+++ b/doc/scaler.texi
@@ -96,6 +96,24 @@ Set scaling algorithm parameters. The specified values are specific of
some scaling algorithms and ignored by others. The specified values
are floating point number values.
+@item sws_dither
+Set the dithering algorithm. Accepts one of the following
+values. Default value is @samp{auto}.
+
+@table @samp
+@item auto
+automatic choice
+
+@item none
+no dithering
+
+@item bayer
+bayer dither
+
+@item ed
+error diffusion dither
+@end table
+
@end table
@c man end SCALER OPTIONS