diff --git a/src/threads/thread.c b/src/threads/thread.c
index 8ef0469..858da46 100644
--- a/src/threads/thread.c
+++ b/src/threads/thread.c
@@ -651,7 +651,8 @@ thread_priority_less (const struct list_elem *a, const struct list_elem *b,
   return ta->priority > tb->priority;
 }
 
-/* ss's state must have been changed from
+/* Schedules a new process.  At entry, interrupts must be off and
+   the running process's state must have been changed from
    running to some other state.  This function finds another
    thread to run and switches to it.