diff --git a/docs/glossary.rst b/docs/glossary.rst
index 45caf46..2f19df5 100644
--- a/docs/glossary.rst
+++ b/docs/glossary.rst
@@ -18,6 +18,10 @@
    API
       Application Programming Interface
 
+   BTI
+      Branch Target Identification. An Armv8.5 extension providing additional
+      control flow integrity around indirect branches and their targets.
+
    CoT
    COT
       Chain of Trust
@@ -32,6 +36,9 @@
    DS-5
       Arm Development Studio 5
 
+   DSU
+      DynamIQ Shared Unit
+
    DT
       Device Tree
 
@@ -72,6 +79,10 @@
    MPIDR
       Multiprocessor Affinity Register
 
+   MTE
+      Memory Tagging Extension. An optional Armv8.5 extension that enables
+      hardware-assisted memory tagging.
+
    OEN
       Owning Entity Number
 
@@ -84,6 +95,9 @@
    PDD
       Platform Design Document
 
+   PAUTH
+      Pointer Authentication. An optional extension introduced in Armv8.3.
+
    PMF
       Performance Measurement Framework
 
@@ -138,6 +152,11 @@
    SPM
       Secure Partition Manager
 
+   SSBS
+      Speculative Store Bypass Safe. Introduced in Armv8.5, this configuration
+      bit can be set by software to allow or prevent the hardware from
+      performing speculative operations.
+
    SVE
       Scalable Vector Extension
 
@@ -168,6 +187,9 @@
    TZC
       TrustZone Controller
 
+   UBSAN
+      Undefined Behavior Sanitizer
+
    UEFI
       Unified Extensible Firmware Interface
 
@@ -177,4 +199,4 @@
    XLAT
       Translation (abbr.). For example, "XLAT table".
 
-.. _`Arm Glossary`: https://developer.arm.com/support/arm-glossary
\ No newline at end of file
+.. _`Arm Glossary`: https://developer.arm.com/support/arm-glossary