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-rw-r--r--docs/system/arm/virt.rst9
1 files changed, 6 insertions, 3 deletions
diff --git a/docs/system/arm/virt.rst b/docs/system/arm/virt.rst
index 1544632b67..5fe045cbf0 100644
--- a/docs/system/arm/virt.rst
+++ b/docs/system/arm/virt.rst
@@ -96,14 +96,17 @@ gic-version
   Valid values are:
 
   ``2``
-    GICv2
+    GICv2. Note that this limits the number of CPUs to 8.
   ``3``
-    GICv3
+    GICv3. This allows up to 512 CPUs.
+  ``4``
+    GICv4. Requires ``virtualization`` to be ``on``; allows up to 317 CPUs.
   ``host``
     Use the same GIC version the host provides, when using KVM
   ``max``
     Use the best GIC version possible (same as host when using KVM;
-    currently same as ``3``` for TCG, but this may change in future)
+    with TCG this is currently ``3`` if ``virtualization`` is ``off`` and
+    ``4`` if ``virtualization`` is ``on``, but this may change in future)
 
 its
   Set ``on``/``off`` to enable/disable ITS instantiation. The default is ``on``