diff --git a/docs/design/cpu-specific-build-macros.rst b/docs/design/cpu-specific-build-macros.rst
index 515cde3..430dc04 100644
--- a/docs/design/cpu-specific-build-macros.rst
+++ b/docs/design/cpu-specific-build-macros.rst
@@ -774,6 +774,10 @@
    CPU. This needs to be enabled only for revisions r0p0, r1p0 and r2p0 of the
    CPU, it is fixed in r2p1.
 
+-  ``ERRATA_X2_2136059``: This applies errata 2136059 workaround to Cortex-X2
+   CPU. This needs to be enabled only for revisions r0p0, r1p0 and r2p0 of the
+   CPU, it is fixed in r2p1.
+
 -  ``ERRATA_X2_2216384``: This applies errata 2216384 workaround to Cortex-X2
    CPU. This needs to be enabled only for revisions r0p0, r1p0 and r2p0 of the
    CPU, it is fixed in r2p1.