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-rw-r--r--docs/system/arm/virt.rst4
1 files changed, 4 insertions, 0 deletions
diff --git a/docs/system/arm/virt.rst b/docs/system/arm/virt.rst
index 0c9c2ce035..adf446c0a2 100644
--- a/docs/system/arm/virt.rst
+++ b/docs/system/arm/virt.rst
@@ -144,6 +144,10 @@ highmem-mmio
   Set ``on``/``off`` to enable/disable the high memory region for PCI MMIO.
   The default is ``on``.
 
+highmem-mmio-size
+  Set the high memory region size for PCI MMIO. Must be a power of 2 and
+  greater than or equal to the default size (512G).
+
 gic-version
   Specify the version of the Generic Interrupt Controller (GIC) to provide.
   Valid values are: