diff --git a/docs/design/cpu-specific-build-macros.rst b/docs/design/cpu-specific-build-macros.rst
index 9aaa078..416f9ee 100644
--- a/docs/design/cpu-specific-build-macros.rst
+++ b/docs/design/cpu-specific-build-macros.rst
@@ -881,6 +881,10 @@
 
 For Cortex-A715, the following errata build flags are defined :
 
+-  ``ERRATA_A715_2420947``: This applies errata 2420947 workaround to
+   Cortex-A715 CPU. This needs to be enabled only for revision r1p0.
+   It is fixed in r1p1.
+
 -  ``ERRATA_A715_2429384``: This applies errata 2429384 workaround to
    Cortex-A715 CPU. This needs to be enabled for revision r1p0. There is no
    workaround for revision r0p0. It is fixed in r1p1.