diff --git a/docs/getting_started/porting-guide.rst b/docs/getting_started/porting-guide.rst
index 5786dd3..af36b6a 100644
--- a/docs/getting_started/porting-guide.rst
+++ b/docs/getting_started/porting-guide.rst
@@ -2202,6 +2202,19 @@
 above the CPU might require initialization due to having previously been in
 low power states. The generic code expects the handler to succeed.
 
+plat_psci_ops.pwr_domain_on_finish_late() [optional]
+...........................................................
+
+This optional function is called by the PSCI implementation after the calling
+CPU is fully powered on with respective data caches enabled. The calling CPU and
+the associated cluster are guaranteed to be participating in coherency. This
+function gives the flexibility to perform any platform-specific actions safely,
+such as initialization or modification of shared data structures, without the
+overhead of explicit cache maintainace operations.
+
+The ``target_state`` has a similar meaning as described in the ``pwr_domain_on_finish()``
+operation. The generic code expects the handler to succeed.
+
 plat_psci_ops.pwr_domain_suspend_finish()
 .........................................