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diff --git a/docs/user-guide.rst b/docs/user-guide.rst
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@@ -355,6 +355,16 @@ Common build options
that is only required for the assertion and does not fit in the assertion
itself.
+- ``ENABLE_BACKTRACE``: This option controls whether to enables backtrace
+ dumps or not. It is supported in both AArch64 and AArch32. However, in
+ AArch32 the format of the frame records are not defined in the AAPCS and they
+ are defined by the implementation. This implementation of backtrace only
+ supports the format used by GCC when T32 interworking is disabled. For this
+ reason enabling this option in AArch32 will force the compiler to only
+ generate A32 code. This option is enabled by default only in AArch64 debug
+ builds, but this behaviour can be overriden in each platform's Makefile or in
+ the build command line.
+
- ``ENABLE_MPAM_FOR_LOWER_ELS``: Boolean option to enable lower ELs to use MPAM
feature. MPAM is an optional Armv8.4 extension that enables various memory
system components and resources to define partitions; software running at