diff --git a/docs/plat/arm/arm-build-options.rst b/docs/plat/arm/arm-build-options.rst
index a6f3796..9622de6 100644
--- a/docs/plat/arm/arm-build-options.rst
+++ b/docs/plat/arm/arm-build-options.rst
@@ -114,6 +114,11 @@
    management operations and for SCP RAM Firmware transfer. If this option
    is set to 1, then SCMI/SDS drivers will be used. Default is 0.
 
+ - ``CSS_SGI_CHIP_COUNT``: Configures the number of chips on a SGI/RD platform
+   which supports multi-chip operation. If ``CSS_SGI_CHIP_COUNT`` is set to any
+   valid value greater than 1, the platform code performs required configuration
+   to support multi-chip operation.
+
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