cmd/client/dec.go         |  9 +++++++++
 cmd/client/dec_complex.go |  9 +++++++++
 cmd/client/main.go        |  3 +++
 doc/index.texi            |  1 +
 doc/libopus.texi          | 26 ++++++++++++++++++++++++++
 mk-bin                    | 10 ++++++----

diff --git a/cmd/client/dec.go b/cmd/client/dec.go
new file mode 100644
index 0000000000000000000000000000000000000000..f94b000a1df99ab6efc59f6ba734c0724e93034526cab0eb89dbe057be7863f3
--- /dev/null
+++ b/cmd/client/dec.go
@@ -0,0 +1,9 @@
+//go:build !decodersetcomplexity
+
+package main
+
+import "gopkg.in/hraban/opus.v2"
+
+func DecoderSetComplexity(dec *opus.Decoder, complexity int) error {
+	return nil
+}
diff --git a/cmd/client/dec_complex.go b/cmd/client/dec_complex.go
new file mode 100644
index 0000000000000000000000000000000000000000..49aad0d4a2582e050192a204af232da3056f0f2827e30846e767c74145a16ac9
--- /dev/null
+++ b/cmd/client/dec_complex.go
@@ -0,0 +1,9 @@
+//go:build decodersetcomplexity
+
+package main
+
+import "gopkg.in/hraban/opus.v2"
+
+func DecoderSetComplexity(dec *opus.Decoder, complexity int) error {
+	return dec.SetComplexity(complexity)
+}
diff --git a/cmd/client/main.go b/cmd/client/main.go
index 118a7fed55b076517fd8339680307bfa1ad0c03d59dc976006d5903715de0d1e..1cb65bfcc71e362dd577d73a251b181e23aaba930c05e185d6dee548f2c89438 100644
--- a/cmd/client/main.go
+++ b/cmd/client/main.go
@@ -318,6 +318,9 @@ 					dec, err := opus.NewDecoder(vors.Rate, 1)
 					if err != nil {
 						log.Fatal(err)
 					}
+					if err = DecoderSetComplexity(dec, 10); err != nil {
+						log.Fatal(err)
+					}
 
 					var player io.WriteCloser
 					var cmd *exec.Cmd
diff --git a/doc/index.texi b/doc/index.texi
index f576f9db0e03ec2bca7b4d6b1c88e26e52d1acfcb1a1aef61a3a6d8e5d636735..f87061a6156ca8b32a9b268c8ff19d42c1b6a152e78b91d1fedd02575d7829b1 100644
--- a/doc/index.texi
+++ b/doc/index.texi
@@ -56,6 +56,7 @@
 @include install.texi
 @include usage.texi
 @include vad.texi
+@include libopus.texi
 @include proto.texi
 
 @bye
diff --git a/doc/libopus.texi b/doc/libopus.texi
new file mode 100644
index 0000000000000000000000000000000000000000..7a3c589c6cbc6374a1ce941e13df5ce8267afba2600d875544d6b871c7dc0530
--- /dev/null
+++ b/doc/libopus.texi
@@ -0,0 +1,26 @@
+@node libopus
+@unnumbered libopus
+
+It is @strong{strongly} advisable to use the latest and much more
+advanced version of @code{libopus}.
+@url{https://wiki.hydrogenaud.io/index.php?title=Opus, Look} how many
+features and optimisations it gains from version to version.
+
+Current latest version @url{https://opus-codec.org/demo/opus-1.5/, brings}
+various ML-related enhancements for the decoder. Unfortunately Opus
+wrapper library does not provide @code{Decoder.SetComplexity} call.
+There is @url{git://git.stargrave.org/go-opus.git, fork} fork including
+it. Clone it somewhere, add Go module replacement in your current's
+@file{go.mod} file and build client with @code{decodersetcomplexity} tag
+specified:
+
+@example
+$ git clone git://git.stargrave.org/go-opus.git
+$ realpath go-opus | read pth
+$ echo "replace gopkg.in/hraban/opus.v2 => $pth" >> go.mod
+$ ./mk-bin decodersetcomplexity
+@end example
+
+Do not forget, that @code{libopus} must be built with
+@code{--enable-deep-plc} and @code{--enable-osce} to enable use of those
+advanced techniques.
diff --git a/mk-bin b/mk-bin
index 094a8539a295d64a2ba6a90e075589b54227de64db7d97bfd82d0c01c22e0a24..a3f54bcc2f92f914639a97c7ebb5f4e341f44da28c6b8f03ca9796e6e61cf253 100755
--- a/mk-bin
+++ b/mk-bin
@@ -3,7 +3,9 @@
 mkdir -p bin
 [ -d vendor ] && $vendor="-mod=vendor"
 strip=-ldflags=-s
-go build -C cmd/vad $strip $vendor $@ -o ../../bin/vors-vad
-go build -C cmd/keygen $strip $vendor $@ -o ../../bin/vors-keygen
-go build -C cmd/server $strip $vendor $@ -o ../../bin/vors-server
-go build -C cmd/client -tags nolibopusfile $strip $vendor $@ -o ../../bin/vors-client
+tags="nolibopusfile"
+[ -z "$1" ] || tags="$tags,$1"
+go build -C cmd/vad $strip $vendor -o ../../bin/vors-vad
+go build -C cmd/keygen $strip $vendor -o ../../bin/vors-keygen
+go build -C cmd/server $strip $vendor -o ../../bin/vors-server
+go build -C cmd/client -tags $tags $strip $vendor -o ../../bin/vors-client