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diff --git a/Platform/Marvell/Documentation/PortingGuide/Mdio.txt b/Platform/Marvell/Documentation/PortingGuide/Mdio.txt
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+MDIO driver configuration
+-------------------------
+MDIO driver provides access to network PHYs' registers via MARVELL_MDIO_READ and
+MARVELL_MDIO_WRITE functions (MARVELL_MDIO_PROTOCOL). Following PCD is required:
+
+  gMarvellTokenSpaceGuid.PcdMdioBaseAddress
+  (base address of SMI management register)