diff --git a/docs/plat/arm/arm-build-options.rst b/docs/plat/arm/arm-build-options.rst
index a086a98..3fad566 100644
--- a/docs/plat/arm/arm-build-options.rst
+++ b/docs/plat/arm/arm-build-options.rst
@@ -137,7 +137,8 @@
 ---------------------
 
 - ``FVP_TRUSTED_SRAM_SIZE``: Size (in kilobytes) of the Trusted SRAM region to
-  utilize when building for the FVP platform. This option defaults to 256.
+  utilize when building for the FVP platform. This option defaults to 256 with
+  build option ENABLE_RME=0 and 384 for ENABLE_RME=1.
 
 Arm Juno Build Options
 ----------------------