diff --git a/specification/bibliography.adoc b/specification/bibliography.adoc
index 329b9d9..6feccb7 100644
--- a/specification/bibliography.adoc
+++ b/specification/bibliography.adoc
@@ -66,4 +66,6 @@ https://datatracker.ietf.org/doc/rfc5758/[https://datatracker.ietf.org/doc/rfc57
 
 * [[[CoVE-IO,22]]] RISC-V CoVE-IO[https://github.com/riscv-non-isa/riscv-ap-tee-io/releases/download/v0.1.0/riscv-cove-io.pdf]
 
+* [[[UEFI, 23]]] Unified Extensible Firmware Interface (UEFI) Specification v2.1[https://uefi.org/specs/UEFI/2.10/index.html]
+
 bibliography::[]