diff --git a/services/spd/tspd/tspd_main.c b/services/spd/tspd/tspd_main.c
index 4b89425..1a06459 100644
--- a/services/spd/tspd/tspd_main.c
+++ b/services/spd/tspd/tspd_main.c
@@ -231,7 +231,7 @@
 		return 1;
 
 	/*
-	 * We could inspect the SP image and determine it's execution
+	 * We could inspect the SP image and determine its execution
 	 * state i.e whether AArch32 or AArch64. Assuming it's AArch64
 	 * for the time being.
 	 */
@@ -461,7 +461,7 @@
 #endif
 
 	/*
-	 * These function IDs is used only by the SP to indicate it has
+	 * These function IDs are used only by the SP to indicate it has
 	 * finished:
 	 * 1. turning itself on in response to an earlier psci
 	 *    cpu_on request
@@ -472,7 +472,7 @@
 	case TSP_RESUME_DONE:
 
 	/*
-	 * These function IDs is used only by the SP to indicate it has
+	 * These function IDs are used only by the SP to indicate it has
 	 * finished:
 	 * 1. suspending itself after an earlier psci cpu_suspend
 	 *    request.
diff --git a/services/std_svc/psci/psci_private.h b/services/std_svc/psci/psci_private.h
index 8c028a7..3286cf6 100644
--- a/services/std_svc/psci/psci_private.h
+++ b/services/std_svc/psci/psci_private.h
@@ -206,10 +206,10 @@
 void psci_cpu_on_finish(unsigned int cpu_idx,
 			psci_power_state_t *state_info);
 
-/* Private exported functions from psci_cpu_off.c */
+/* Private exported functions from psci_off.c */
 int psci_do_cpu_off(unsigned int end_pwrlvl);
 
-/* Private exported functions from psci_pwrlvl_suspend.c */
+/* Private exported functions from psci_suspend.c */
 void psci_cpu_suspend_start(entry_point_info_t *ep,
 			unsigned int end_pwrlvl,
 			psci_power_state_t *state_info,