diff --git a/docs/design/cpu-specific-build-macros.rst b/docs/design/cpu-specific-build-macros.rst
index 73c7ac5..0f1f92a 100644
--- a/docs/design/cpu-specific-build-macros.rst
+++ b/docs/design/cpu-specific-build-macros.rst
@@ -353,6 +353,10 @@
   Cortex-A78C CPU. This needs to be enabled for revision r0p0. The erratum is
   fixed in r0p1.
 
+- ``ERRATA_A78C_1827440`` : This applies errata 1827440 workaround to
+  Cortex-A78C CPU. This needs to be enabled for revision r0p0. The erratum is
+  fixed in r0p1.
+
 - ``ERRATA_A78C_2132064`` : This applies errata 2132064 workaround to
   Cortex-A78C CPU. This needs to be enabled for revisions r0p1, r0p2 and
   it is still open.