diff --git a/docs/porting-guide.rst b/docs/porting-guide.rst
index d06d153..3b85728 100644
--- a/docs/porting-guide.rst
+++ b/docs/porting-guide.rst
@@ -2938,6 +2938,8 @@
 possible on platforms where this is guaranteed to be terminal, however, it is
 strongly discouraged going forward.
 
+Previously this function was called ``pwr_domain_pwr_down_wfi()``.
+
 plat_psci_ops.pwr_domain_on_finish()
 ....................................