diff --git a/week9/T8.c b/week9/T8.c
index 636f757..f463b33 100644
--- a/week9/T8.c
+++ b/week9/T8.c
@@ -1,3 +1,10 @@
+/*
+ * Author: Walter
+ * Student ID: 1930006025
+ * Week_9_task_8
+ * HeapSort
+ */
+
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/week9/T8.h b/week9/T8.h
index c370b26..4dec315 100644
--- a/week9/T8.h
+++ b/week9/T8.h
@@ -1,3 +1,10 @@
+/*
+ * Author: Walter
+ * Student ID: 1930006025
+ * Week_9_task_8
+ * HeapSort
+ */
+
 #include <time.h>