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diff --git a/docs/user-guide.rst b/docs/user-guide.rst
index 880fe7d9..a1719ef2 100644
--- a/docs/user-guide.rst
+++ b/docs/user-guide.rst
@@ -390,6 +390,14 @@ Common build options
handled at EL3, and a panic will result. This is supported only for AArch64
builds.
+- ``FAULT_INJECTION_SUPPORT``: ARMv8.4 externsions introduced support for fault
+ injection from lower ELs, and this build option enables lower ELs to use
+ Error Records accessed via System Registers to inject faults. This is
+ applicable only to AArch64 builds.
+
+ This feature is intended for testing purposes only, and is advisable to keep
+ disabled for production images.
+
- ``FIP_NAME``: This is an optional build option which specifies the FIP
filename for the ``fip`` target. Default is ``fip.bin``.