diff --git a/DOCS/interface-changes.rst b/DOCS/interface-changes.rst
index 9f61a13e59..7756aceb85 100644
--- a/DOCS/interface-changes.rst
+++ b/DOCS/interface-changes.rst
@@ -46,6 +46,8 @@ Interface changes
     - change how spdif codecs are selected. You can't enable spdif passthrough
       with --ad anymore. This was deprecated; use --audio-spdif instead.
     - deprecate the "family" selection with --ad/--vd
+    - explicitly mark --ad-spdif-dtshd as deprecated (it was done so a long time
+      ago, but it didn't complain when using the option)
  --- mpv 0.22.0 ---
     - the "audio-device-list" property now sets empty device description to the
       device name as a fallback
diff --git a/options/options.c b/options/options.c
index 108c805de7..f79df7d82f 100644
--- a/options/options.c
+++ b/options/options.c
@@ -426,7 +426,8 @@ const m_option_t mp_opts[] = {
 
     OPT_STRING("audio-spdif", audio_spdif, 0),
 
-    OPT_FLAG("ad-spdif-dtshd", dtshd, 0),
+    OPT_FLAG("ad-spdif-dtshd", dtshd, 0,
+             .deprecation_message = "use --audio-spdif instead"),
 
     OPT_CHOICE_C("hwdec", hwdec_api, 0, mp_hwdec_names),
     OPT_STRING("hwdec-codecs", hwdec_codecs, 0),