diff --git a/codes/typescript/chapter_hashing/array_hash_map.ts b/codes/typescript/chapter_hashing/array_hash_map.ts
index e4d1c83f5..41a153d6a 100644
--- a/codes/typescript/chapter_hashing/array_hash_map.ts
+++ b/codes/typescript/chapter_hashing/array_hash_map.ts
@@ -1,3 +1,9 @@
+/*
+ * File: array_hash_map.ts
+ * Created Time: 2022-12-29
+ * Author: Daniel (better.sunjian@gmail.com)
+ */
+
 /* 键值对 Number -> String */
 class Entry {
   public key: number;
diff --git a/codes/typescript/chapter_hashing/hash_map.ts b/codes/typescript/chapter_hashing/hash_map.ts
index 8849d98f3..a979d9fc1 100644
--- a/codes/typescript/chapter_hashing/hash_map.ts
+++ b/codes/typescript/chapter_hashing/hash_map.ts
@@ -1,3 +1,9 @@
+/*
+ * File: hash_map.ts
+ * Created Time: 2022-12-29
+ * Author: Daniel (better.sunjian@gmail.com)
+ */
+
 import ArrayHashMap from './array_hash_map';
 
 class HashMap {