diff --git a/info.rkt b/info.rkt
index 35fd700..c8f399d 100644
--- a/info.rkt
+++ b/info.rkt
@@ -12,4 +12,9 @@
     "simple-log"
     ))
 (define build-deps
-  '("rackunit-lib"))
+  '("racket-doc"
+    "rackunit-lib"
+    "scribble-lib"))
+
+(define scribblings
+  '(("scribblings/racket-sonos.scrbl" () (library))))
diff --git a/scribblings/racket-sonos.scrbl b/scribblings/racket-sonos.scrbl
new file mode 100644
index 0000000..b45f06f
--- /dev/null
+++ b/scribblings/racket-sonos.scrbl
@@ -0,0 +1,143 @@
+#lang scribble/manual
+
+@(require
+  (for-label
+   racket/base
+   racket/contract
+   racket/list
+   racket-sonos
+   racket-upnp))
+
+@title{racket-sonos}
+@author{Hans Dijkema}
+
+@defmodule[racket-sonos]
+
+The @racketmodname[racket-sonos] library adds Sonos topology support to
+@racketmodname[racket-upnp]. It recognises Sonos and IKEA SYMFONISK devices
+and turns the vendor-specific zone-group topology into logical media
+renderers. A logical renderer can represent a single speaker, a stereo pair,
+a bonded home-theatre setup, or a group of rooms.
+
+The library does not perform device discovery itself. Use
+@racket[query-upnp-devices] from @racketmodname[racket-upnp], then pass the
+complete discovery result to @racket[sonos-groups].
+
+@section{Device helpers}
+
+@defproc[(sonos-device? [device any/c]) boolean?]{
+
+Returns a true value when @racket[device] is a UPnP device that advertises a
+@tt{ZoneGroupTopology} service, identifies its manufacturer as Sonos, or has a
+model name containing @litchar{SYMFONISK}. The textual comparisons are
+case-insensitive.
+
+Returns @racket[#f] for values that are not UPnP devices.
+}
+
+@defproc[(sonos-device-name [device sonos-device?]) string?]{
+
+Returns the friendly room name of @racket[device]. For the common names
+@litchar{Living Room - Sonos One} and
+@litchar{Kitchen - SYMFONISK Bookshelf}, this function returns
+@litchar{Living Room} and @litchar{Kitchen}, respectively. Other friendly
+names are returned unchanged.
+
+Raises @racket[exn:fail:contract?] when @racket[device] is not recognised by
+@racket[sonos-device?].
+}
+
+@section{Reading the Sonos topology}
+
+@defproc[(sonos-groups [devices (listof upnp-device?)])
+         (listof sonos-group?)]{
+
+Finds the first @tt{ZoneGroupTopology} service among @racket[devices], invokes
+its @tt{GetZoneGroupState} action, and returns the logical Sonos groups in the
+response.
+
+Pass the complete result of @racket[(query-upnp-devices 'all)]. In particular,
+@racket[devices] must contain the UPnP media-renderer device for every group
+coordinator that should be returned. A topology group whose coordinator cannot
+be matched to a media renderer is omitted and a warning is logged.
+
+Returns the empty list when none of the supplied devices provides the topology
+service or when the service returns an empty state. Network and SOAP failures
+from @racket[upnp-service-call], and malformed topology XML, are reported as
+exceptions.
+}
+
+@section{Group values}
+
+@defstruct[sonos-group
+           ([id (or/c #f string?)]
+            [name string?]
+            [coordinator-id (or/c #f string?)]
+            [member-ids (listof string?)]
+            [bonded? boolean?]
+            [stereo? boolean?]
+            [grouped? boolean?]
+            [renderer media-renderer?])
+           #:transparent]{
+
+Represents one logical renderer from the Sonos zone-group topology. Values
+returned by @racket[sonos-groups] have the following fields:
+
+@itemlist[
+ @item{@racket[id] is the topology's group identifier. It falls back to the
+       coordinator identifier when the topology does not supply one.}
+ @item{@racket[name] combines the distinct visible room names with
+       @litchar{ + }. The suffix @litchar{ (stereo)} or
+       @litchar{ (bonded)} describes bonded configurations.}
+ @item{@racket[coordinator-id] is the normalised UDN of the device that
+       coordinates playback. A leading @litchar{uuid:} and any suffix after a
+       Sonos @litchar{RINCON_} identifier are removed.}
+ @item{@racket[member-ids] contains the normalised identifiers of all members,
+       including invisible bonded members.}
+ @item{@racket[bonded?] is true for stereo pairs and other bonded arrangements,
+       such as a soundbar with satellites.}
+ @item{@racket[stereo?] is true when the channel map contains both the left and
+       right front channels.}
+ @item{@racket[grouped?] is true when more than one visible member belongs to
+       the group. A bonded setup with only one visible room is therefore not
+       necessarily grouped.}
+ @item{@racket[renderer] is the coordinator's @racket[media-renderer?] value.
+       Supply this value to the playback operations provided by
+       @racketmodname[racket-upnp].}
+]
+}
+
+@section{Example}
+
+This example discovers all UPnP devices, reads the Sonos topology, and prints
+the logical renderers:
+
+@racketblock[
+(require racket-sonos
+         racket-upnp)
+
+(define devices
+  (query-upnp-devices 'all))
+
+(for ([group (in-list (sonos-groups devices))])
+  (printf "~a: ~a member(s)~a~n"
+          (sonos-group-name group)
+          (length (sonos-group-member-ids group))
+          (if (sonos-group-grouped? group)
+              " (grouped)"
+              "")))
+]
+
+To control a group, use its coordinator renderer. For example:
+
+@racketblock[
+(define groups
+  (sonos-groups devices))
+
+(unless (null? groups)
+  (media-renderer-play-uri!
+   (sonos-group-renderer (first groups))
+   "http://192.0.2.10:8080/audio/example.mp3"))
+]
+
+@index-section[]