diff --git a/docs/design/cpu-specific-build-macros.rst b/docs/design/cpu-specific-build-macros.rst
index b19c534..cd4d0fd 100644
--- a/docs/design/cpu-specific-build-macros.rst
+++ b/docs/design/cpu-specific-build-macros.rst
@@ -423,6 +423,9 @@
 -  ``ERRATA_N2_2242415``: This applies errata 2242415 workaround to Neoverse-N2
    CPU. This needs to be enabled for revision r0p0 of the CPU and is still open.
 
+-  ``ERRATA_N2_2138958``: This applies errata 2138958 workaround to Neoverse-N2
+   CPU. This needs to be enabled for revision r0p0 of the CPU and is still open.
+
 DSU Errata Workarounds
 ----------------------