diff --git a/arch/sim/src/up_simsmp.c b/arch/sim/src/up_simsmp.c
index f60f2bf9fb1..6ad52069e6b 100644
--- a/arch/sim/src/up_simsmp.c
+++ b/arch/sim/src/up_simsmp.c
@@ -133,11 +133,11 @@ static void *sim_cpu0_trampoline(void *arg)
       return NULL;
     }
 
-  /* Give control to os_start */
+  /* Give control to os_start() */
 
   os_start();
 
-  /* The os_start() should not return */
+  /* os_start() should not return */
 
   return NULL;
 }