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-rw-r--r--docs/system/deprecated.rst8
1 files changed, 8 insertions, 0 deletions
diff --git a/docs/system/deprecated.rst b/docs/system/deprecated.rst
index 6f8bf19d37..728233a8ff 100644
--- a/docs/system/deprecated.rst
+++ b/docs/system/deprecated.rst
@@ -190,6 +190,14 @@ become
 
     -device floppy,unit=1,drive=...
 
+``-drive`` with bogus interface type
+''''''''''''''''''''''''''''''''''''
+
+Drives with interface types other than ``if=none`` are for onboard
+devices.  It is possible to use drives the board doesn't pick up with
+-device.  This usage is now deprecated.  Use ``if=none`` instead.
+
+
 QEMU Machine Protocol (QMP) commands
 ------------------------------------