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-rw-r--r--docs/system/target-i386-desc.rst.inc8
1 files changed, 8 insertions, 0 deletions
diff --git a/docs/system/target-i386-desc.rst.inc b/docs/system/target-i386-desc.rst.inc
index 7d1fffacbe..5ebbcda9db 100644
--- a/docs/system/target-i386-desc.rst.inc
+++ b/docs/system/target-i386-desc.rst.inc
@@ -71,3 +71,11 @@ machine property, i.e.
    |qemu_system_x86| some.img \
    -audiodev <backend>,id=<name> \
    -machine pcspk-audiodev=<name>
+
+Machine-specific options
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+It supports the following machine-specific options:
+
+- ``x-south-bridge=PIIX3|piix4-isa`` (Experimental option to select a particular
+  south bridge. Default: ``PIIX3``)