diff --git a/docs/development.rst b/docs/development.rst
index 60004533..4cb043f6 100644
--- a/docs/development.rst
+++ b/docs/development.rst
@@ -134,17 +134,22 @@ features we wished was there:
 Class instantiation and usage
 =============================
 
-The following diagram shows how Mopidy with the despotify backend is wired
-together. The gray nodes are part of external dependencies, and not Mopidy.
+The following diagram shows how Mopidy with the despotify backend and ALSA
+mixer is wired together. The gray nodes are part of external dependencies, and
+not Mopidy.
 
 .. digraph:: class_instantiation_and_usage
 
     "spytify" [ color="gray" ]
     "despotify" [ color="gray" ]
+    "alsaaudio" [ color="gray" ]
     "__main__" -> "MpdServer" [ label="create 1" ]
+    "__main__" -> "AlsaMixer" [ label="create 1" ]
     "__main__" -> "DespotifyBackend" [ label="create 1" ]
     "MpdServer" -> "MpdSession" [ label="create 1 per client" ]
     "MpdSession" -> "MpdHandler" [ label="pass MPD requests to" ]
     "MpdHandler" -> "DespotifyBackend" [ label="use backend API" ]
     "DespotifyBackend" -> "spytify" [ label="use Python wrapper" ]
     "spytify" -> "despotify" [ label="use C library" ]
+    "DespotifyBackend" -> "AlsaMixer" [ label="use mixer API" ]
+    "AlsaMixer" -> "alsaaudio" [ label="use Python library" ]