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diff --git a/doc/opal-api/opal-pci-set-p2p-157.rst b/doc/opal-api/opal-pci-set-p2p-157.rst
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+OPAL_PCI_SET_P2P
+================
+::
+
+   #define OPAL_PCI_SET_P2P			157
+
+   int64_t opal_pci_set_p2p(uint64_t phbid_init, uint64_t phbid_target,
+				uint64_t desc, uint16_t pe_number)
+
+   /* PCI p2p descriptor */
+   #define OPAL_PCI_P2P_ENABLE		0x1
+   #define OPAL_PCI_P2P_LOAD		0x2
+   #define OPAL_PCI_P2P_STORE		0x4
+
+The host calls this function to enable PCI peer-to-peer on the PHBs.
+
+Parameters
+----------
+::
+
+   uint64_t phbid_init
+   uint64_t phbid_target
+   uint64_t desc
+   uint16_t pe_number
+
+
+``phbid_init``
+  is the value from the PHB node ibm,opal-phbid property for the device initiating the p2p operation
+
+``phbid_target``
+  is the value from the PHB node ibm,opal-phbid property for the device targeted by the p2p operation
+
+``desc``
+  tells whether the p2p operation is a store (OPAL_PCI_P2P_STORE) or load (OPAL_PCI_P2P_LOAD). Can be both.
+  OPAL_PCI_P2P_ENABLE enables/disables the setting
+
+``pe_number``
+  PE number for the initiating device
+
+Return Values
+-------------
+
+``OPAL_SUCCESS``
+  Configuration was successful
+
+``OPAL_PARAMETER``
+  Invalid PHB or mode parameter
+
+``OPAL_UNSUPPORTED``
+  Not supported by hardware