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-rw-r--r--docs/igd-assign.txt1
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diff --git a/docs/igd-assign.txt b/docs/igd-assign.txt
index af4e839..e540403 100644
--- a/docs/igd-assign.txt
+++ b/docs/igd-assign.txt
@@ -48,6 +48,7 @@ Intel document [1] shows how to dump VBIOS to file. For UEFI Option ROM, see
QEMU also provides a "Legacy" mode that implicitly enables full functionality
on IGD, it is automatically enabled when
* IGD generation is 6 to 9 (Sandy Bridge to Comet Lake)
+* IGD claims VGA cycles on host (IGD is VGA controller on host)
* Machine type is i440fx
* IGD is assigned to guest BDF 00:02.0
* ROM BAR or romfile is present