diff --git a/docs/design/cpu-specific-build-macros.rst b/docs/design/cpu-specific-build-macros.rst
index 208d7cf..a871c59 100644
--- a/docs/design/cpu-specific-build-macros.rst
+++ b/docs/design/cpu-specific-build-macros.rst
@@ -897,6 +897,9 @@
 
 For Cortex-X925, the following errata build flags are defined :
 
+- ``ERRATA_X925_2963999``: This applies errata 2963999 workaround to Cortex-X925
+  CPU. This needs to be enabled for revision r0p0. It is fixed in r0p1.
+
 - ``ERRATA_X925_3701747``: This applies errata 3701747 workaround to Cortex-X925
   CPU. This needs to be enabled for revisions r0p0 and r0p1. It is still open.