diff --git a/docs/design/cpu-specific-build-macros.rst b/docs/design/cpu-specific-build-macros.rst
index 2ddccac..ef4c1a3 100644
--- a/docs/design/cpu-specific-build-macros.rst
+++ b/docs/design/cpu-specific-build-macros.rst
@@ -390,6 +390,10 @@
 
 For Neoverse V1, the following errata build flags are defined :
 
+-  ``ERRATA_V1_1618635``: This applies errata 1618635 workaround to Neoverse-V1
+   CPU. This needs to be enabled for revision r0p0 of the CPU, it is fixed in
+   r1p0.
+
 -  ``ERRATA_V1_1774420``: This applies errata 1774420 workaround to Neoverse-V1
    CPU. This needs to be enabled only for revisions r0p0 and r1p0, it is fixed
    in r1p1.