diff --git a/Documentation/i386/boot.txt b/Documentation/i386/boot.txt
index 10312be..c51314b 100644
--- a/Documentation/i386/boot.txt
+++ b/Documentation/i386/boot.txt
@@ -181,6 +181,7 @@
 	5  ELILO
 	7  GRuB
 	8  U-BOOT
+	9  Xen
 
 	Please contact <hpa@zytor.com> if you need a bootloader ID
 	value assigned.