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-rw-r--r--Documentation/arch/riscv/index.md3
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diff --git a/Documentation/arch/riscv/index.md b/Documentation/arch/riscv/index.md
index ea6a5cd47e..e0d37f591c 100644
--- a/Documentation/arch/riscv/index.md
+++ b/Documentation/arch/riscv/index.md
@@ -19,6 +19,9 @@ On entry to a stage or payload (including SELF payloads),
* all harts are running.
* A0 is the hart ID.
* A1 is the pointer to the Flattened Device Tree (FDT).
+* A2 contains the additional program calling argument:
+ - cbmem_top for ramstage
+ - the address of the payload for opensbi
## Additional payload handoff requirements
The location of cbmem should be placed in a node in the FDT.