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diff --git a/docs/user-guide.rst b/docs/user-guide.rst
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@@ -534,6 +534,12 @@ Common build options
optional. It is only needed if the platform makefile specifies that it
is required in order to build the ``fwu_fip`` target.
+- ``SDEI_SUPPORT``: Setting this to ``1`` enables support for Software
+ Delegated Exception Interface to BL31 image. This defaults to ``0``.
+
+ When set to ``1``, the build option ``EL3_EXCEPTION_HANDLING`` must also be
+ set to ``1``.
+
- ``SEPARATE_CODE_AND_RODATA``: Whether code and read-only data should be
isolated on separate memory pages. This is a trade-off between security and
memory usage. See "Isolating code and read-only data on separate memory