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-rw-r--r--docs/user-guide.rst3
1 files changed, 3 insertions, 0 deletions
diff --git a/docs/user-guide.rst b/docs/user-guide.rst
index 0647e705c..ed5ba1842 100644
--- a/docs/user-guide.rst
+++ b/docs/user-guide.rst
@@ -245,6 +245,9 @@ Common build options
BL2U image. In this case, the BL2U in the ARM Trusted Firmware will not
be built.
+- ``BL2_AT_EL3``: This is an optional build option that enables the use of
+ BL2 at EL3 execution level.
+
- ``BL31``: This is an optional build option which specifies the path to
BL31 image for the ``fip`` target. In this case, the BL31 in the ARM
Trusted Firmware will not be built.