diff --git a/Documentation/x86/boot.rst b/Documentation/x86/boot.rst
index 894a19897005..240d084782a6 100644
--- a/Documentation/x86/boot.rst
+++ b/Documentation/x86/boot.rst
@@ -455,6 +455,7 @@ Protocol:	2.00+
 	11 Minimal Linux Bootloader
 	   <http://sebastian-plotz.blogspot.de>
 	12 OVMF UEFI virtualization stack
+	13 barebox
 	== =======================================
 
   Please contact <hpa@zytor.com> if you need a bootloader ID value assigned.