diff --git a/docs/glossary.rst b/docs/glossary.rst
index e087079..08add3a 100644
--- a/docs/glossary.rst
+++ b/docs/glossary.rst
@@ -18,6 +18,9 @@
    API
       Application Programming Interface
 
+   AT
+      Address Translation
+
    BTI
       Branch Target Identification. An Armv8.5 extension providing additional
       control flow integrity around indirect branches and their targets.