diff --git a/docs/getting_started/porting-guide.rst b/docs/getting_started/porting-guide.rst
index c98f3cc..7aaeae2 100644
--- a/docs/getting_started/porting-guide.rst
+++ b/docs/getting_started/porting-guide.rst
@@ -1130,6 +1130,7 @@
 
     soc_version[30:24] = JEP-106 continuation code for the SiP
     soc_version[23:16] = JEP-106 identification code with parity bit for the SiP
+    soc_version[15:0]  = Implementation defined SoC ID
 
 Function : plat_get_soc_revision()
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -1145,6 +1146,18 @@
 
     soc_revision[0:30] = SOC revision of specific SOC
 
+Function : plat_is_smccc_feature_available()
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+::
+
+    Argument : u_register_t
+    Return   : int32_t
+
+This function returns SMC_ARCH_CALL_SUCCESS if the platform supports
+the SMCCC function specified in the argument; otherwise returns
+SMC_ARCH_CALL_NOT_SUPPORTED.
+
 Modifications specific to a Boot Loader stage
 ---------------------------------------------