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diff --git a/roms/skiboot/doc/opal-api/opal-pci-get-set-pbcq-tunnel-bar-164-165.rst b/roms/skiboot/doc/opal-api/opal-pci-get-set-pbcq-tunnel-bar-164-165.rst
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+.. _OPAL_PCI_GET_PBCQ_TUNNEL_BAR:
+
+OPAL_PCI_GET_PBCQ_TUNNEL_BAR
+============================
+
+.. code-block:: c
+
+   #define OPAL_PCI_GET_PBCQ_TUNNEL_BAR 164
+
+   int64_t opal_pci_get_pbcq_tunnel_bar(uint64_t phb_id, uint64_t *addr);
+
+The host calls this function to read the address out of the PBCQ Tunnel
+Bar register.
+
+Parameters
+----------
+
+``phb_id``
+  The value from the PHB node ibm,opal-phbid property for the device.
+
+``addr``
+  A pointer to where the address stored in the PBCQ Tunnel Bar register
+  will be copied.
+
+Return Values
+-------------
+
+:ref:`OPAL_SUCCESS`
+  Operation was successful
+:ref:`OPAL_PARAMETER`
+  Invalid PHB or addr parameter
+:ref:`OPAL_UNSUPPORTED`
+  Not supported by hardware
+
+.. _OPAL_PCI_SET_PBCQ_TUNNEL_BAR:
+
+OPAL_PCI_SET_PBCQ_TUNNEL_BAR
+============================
+
+.. code-block:: c
+
+   #define OPAL_PCI_SET_PBCQ_TUNNEL_BAR 165
+
+   int64_t opal_pci_set_pbcq_tunnel_bar(uint64_t phb_id, uint64_t addr);
+
+The host calls this function to set the PBCQ Tunnel Bar register.
+
+Parameters
+----------
+
+`phb_id`
+  The value from the PHB node ibm,opal-phbid property for the device.
+
+`addr`
+  The value of the address chosen for the PBCQ Tunnel Bar register.
+  If the address is 0, then the PBCQ Tunnel Bar register will be reset.
+  It the address is non-zero, then the PBCQ Tunnel Bar register will be
+  set with ::
+
+   Bit[0:42]      Bit[8:50] of the address
+
+Return Values
+-------------
+
+:ref:`OPAL_SUCCESS`
+  Operation was successful
+:ref:`OPAL_PARAMETER`
+  Invalid PHB or addr parameter
+:ref:`OPAL_UNSUPPORTED`
+  Not supported by hardware