diff --git a/site/docs/hardware/dell9020.md b/site/docs/hardware/dell9020.md
index 82eac77..2825ab8 100644
--- a/site/docs/hardware/dell9020.md
+++ b/site/docs/hardware/dell9020.md
@@ -91,6 +91,14 @@ Kukri's patch is here:
 This patch, at this revision (patchset 31), is what Libreboot uses for this
 port.
 
+QUBES: how to get it working
+-------------------
+
+Qubes requires IOMMU to be turned on. Please now read the next section.
+Qubes *WILL* work, if you configure Libreboot as directed below, but otherwise
+it will fail by default. This is because Libreboot *disables the IOMMU by
+default*, on this board.
+
 Graphics cards and IOMMU
 --------------