diff --git a/docs/firmware-design.rst b/docs/firmware-design.rst
index 4c3c420..facf016 100644
--- a/docs/firmware-design.rst
+++ b/docs/firmware-design.rst
@@ -2366,6 +2366,17 @@
 -  The Compare and Swap instruction is used to implement spinlocks. Otherwise,
    the load-/store-exclusive instruction pair is used.
 
+ARMv8.2
+~~~~~~~
+
+This Architecture Extension is targeted when ``ARM_ARCH_MAJOR`` == 8 and
+``ARM_ARCH_MINOR`` >= 2.
+
+-  The Common not Private (CnP) bit is enabled to indicate that multiple
+   Page Entries in the same Inner Shareable domain use the same translation
+   table entries for a given stage of translation for a particular translation
+   regime.
+
 Code Structure
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