From b729f6239c3eca94e36a4409e3887abc136945b0 Mon Sep 17 00:00:00 2001
From: "Tycho Andersen (AMD)" <tycho@kernel.org>
Date: Mon, 8 Jun 2026 11:17:01 -0600
Subject: [PATCH] README: add note about ciphertext hiding BIOS setting

Signed-off-by: Tycho Andersen (AMD) <tycho@kernel.org>
---
 README.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/README.md b/README.md
index 633900d02340..27c999703fe5 100644
--- a/README.md
+++ b/README.md
@@ -96,6 +96,12 @@ Advanced → NBIO Common Options → IOMMU/Security
     SEV-SNP Support → Enable
 ```
 
+Optionally, to enable ciphertext hiding:
+
+```
+UMC Common Options > DDR RAS > ECC Configuration > CypherText Hiding > Enable
+```
+
 ### SEV Firmware
 
 Minimum firmware versions are listed in the