diff --git a/docs/getting_started/porting-guide.rst b/docs/getting_started/porting-guide.rst
index 17fd546..bb14717 100644
--- a/docs/getting_started/porting-guide.rst
+++ b/docs/getting_started/porting-guide.rst
@@ -1999,7 +1999,7 @@
 
 ::
 
-    Argument : unsigned int, const psci_power_state_t *, int
+    Argument : unsigned int, const psci_power_state_t *, unsigned int
     Return   : u_register_t
 
 This is an optional interface that is is invoked after resuming from a low power