diff --git a/qemu-deprecated.texi b/qemu-deprecated.texi
index 5d2d7a35884bd79b7e61c0ae22160fe85bccd47c..cb4291f1e5bcc4d482c119fe54bb75f8fef6e150 100644
--- a/qemu-deprecated.texi
+++ b/qemu-deprecated.texi
@@ -128,6 +128,13 @@ The @option{[hub_id name]} parameter tuple of the 'hostfwd_add' and
 The ``ivshmem'' device type is replaced by either the ``ivshmem-plain''
 or ``ivshmem-doorbell`` device types.
 
+@subsection bluetooth (since 3.1)
+
+The bluetooth subsystem is unmaintained since many years and likely bitrotten
+quite a bit. It will be removed without replacement unless some users speaks
+up at the @email{qemu-devel@@nongnu.org} mailing list with information about
+their usecases.
+
 @section System emulator machines
 
 @subsection pc-0.10 and pc-0.11 (since 3.0)
diff --git a/qemu-options.hx b/qemu-options.hx
index 38c7a978c119d26d8e67b2881cb4ac6ee8a53b87..ee379b32e370a4ea054bba65615379fe3e5d3438 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -2772,6 +2772,10 @@ logic.  The Transport Layer is decided by the machine type.  Currently
 the machines @code{n800} and @code{n810} have one HCI and all other
 machines have none.
 
+Note: This option and the whole bluetooth subsystem is considered as deprecated.
+If you still use it, please send a mail to @email{qemu-devel@@nongnu.org} where
+you describe your usecase.
+
 @anchor{bt-hcis}
 The following three types are recognized:
 
diff --git a/vl.c b/vl.c
index 55bab005b6316eb9a1a8a8c2db36be9d8d033fbb..fa25d1ae2d7b08abd85dea01460d1c5b56ae7ccd 100644
--- a/vl.c
+++ b/vl.c
@@ -3269,6 +3269,10 @@ int main(int argc, char **argv, char **envp)
                 break;
 #endif
             case QEMU_OPTION_bt:
+                warn_report("The bluetooth subsystem is deprecated and will "
+                            "be removed soon. If the bluetooth subsystem is "
+                            "still useful for you, please send a mail to "
+                            "qemu-devel@nongnu.org with your usecase.");
                 add_device_config(DEV_BT, optarg);
                 break;
             case QEMU_OPTION_audio_help: