diff --git a/doc/platform/am1i/notes.md b/doc/platform/am1i/notes.md
index cdbd169..97a79ba 100644
--- a/doc/platform/am1i/notes.md
+++ b/doc/platform/am1i/notes.md
@@ -1 +1,5 @@
 # am1i: platform-specific notes
+
++ There is currently no IOMMU support on this platform.
+  [Apparently](https://mail.coreboot.org/pipermail/coreboot/2018-February/086150.html)
+  the chip supports it, but the motherboard does not.