diff --git a/include/runtime_services/psci.h b/include/runtime_services/psci.h
index f93ee40..caa74a9 100644
--- a/include/runtime_services/psci.h
+++ b/include/runtime_services/psci.h
@@ -208,6 +208,12 @@
 #define PSCI_E_INVALID_ADDRESS	-9
 
 /*******************************************************************************
+ * PSCI suspend mode related constants.
+ ******************************************************************************/
+#define PSCI_PLAT_COORD		0x0
+#define PSCI_OS_INIT		0x1
+
+/*******************************************************************************
  * PSCI affinity state related constants.
  ******************************************************************************/
 #define PSCI_STATE_ON		0x0