diff --git a/NEWS b/NEWS
index 2cb980345..b0657d4a9 100644
--- a/NEWS
+++ b/NEWS
@@ -1,4 +1,6 @@
 ver 0.21.11 (not yet released)
+* input
+  - tidal: deprecated because Tidal has changed the protocol
 * decoder
   - wildmidi: log error if library initialization fails
 * output
diff --git a/doc/plugins.rst b/doc/plugins.rst
index 71485c8c1..6feb00438 100644
--- a/doc/plugins.rst
+++ b/doc/plugins.rst
@@ -245,6 +245,11 @@ tidal
 
 Play songs from the commercial streaming service `Tidal <http://tidal.com/>`_. It plays URLs in the form tidal://track/ID, e.g.:
 
+.. warning::
+
+   This plugin is currently defunct because Tidal has changed the
+   protocol and decided not to share documentation.
+
 .. code-block:: none
 
     mpc add tidal://track/59727857
diff --git a/src/input/plugins/TidalInputPlugin.cxx b/src/input/plugins/TidalInputPlugin.cxx
index 95025954b..3592262b2 100644
--- a/src/input/plugins/TidalInputPlugin.cxx
+++ b/src/input/plugins/TidalInputPlugin.cxx
@@ -180,6 +180,8 @@ InitTidalInput(EventLoop &event_loop, const ConfigBlock &block)
 	if (password == nullptr)
 		throw PluginUnavailable("No Tidal password configured");
 
+	FormatWarning(tidal_domain, "The Tidal input plugin is deprecated because Tidal has changed the protocol and doesn't share documentation");
+
 	tidal_audioquality = block.GetBlockValue("audioquality", "HIGH");
 
 	tidal_session = new TidalSessionManager(event_loop, base_url, token,