diff --git a/docs/design/cpu-specific-build-macros.rst b/docs/design/cpu-specific-build-macros.rst
index c9213c9..0d6a5dd 100644
--- a/docs/design/cpu-specific-build-macros.rst
+++ b/docs/design/cpu-specific-build-macros.rst
@@ -836,6 +836,10 @@
   CPU. This needs to be enabled only for revisions r0p0, r1p0 and r1p1 of the
   CPU. It is fixed in r1p2.
 
+- ``ERRATA_X3_3213672``: This applies errata 3213672 workaround to Cortex-X3
+  CPU. This needs to be enabled for revisions r0p0, r1p0, r1p1 and r1p2
+  of the CPU. It is still open.
+
 - ``ERRATA_X3_3692984``: This applies errata 3692984 workaround to Cortex-X3
   CPU. This needs to be enabled for revisions r0p0, r1p0, r1p1 and r1p2
   of the CPU. It is still open.