diff --git a/README.md b/README.md
index 0f48b20..7700ea3 100644
--- a/README.md
+++ b/README.md
@@ -145,6 +145,8 @@ func HmacMd5(data, key string) string //get hmac md5 value
 func HmacSha1(data, key string) string //get hmac sha1 value
 func HmacSha256(data, key string) string //get hmac sha256 value
 func HmacSha512(data, key string) string //get hmac sha512 value
+func Md5String(s string) string //return the md5 value of string
+func Md5File(filename string) (string, error) //return the md5 value of file
 func Sha1(data string) string //get sha1 value
 func Sha256(data string) string //getsha256 value
 func Sha512(data string) string //get sha512 value
diff --git a/README_zh-CN.md b/README_zh-CN.md
index 351a9fa..7c846ec 100644
--- a/README_zh-CN.md
+++ b/README_zh-CN.md
@@ -146,6 +146,8 @@ func HmacMd5(data, key string) string //获取hmac md5值
 func HmacSha1(data, key string) string //获取hmac sha1值
 func HmacSha256(data, key string) string //获取hmac sha256值
 func HmacSha512(data, key string) string //获取hmac sha512值
+func Md5String(s string) string //获取字符串md5值
+func Md5File(filename string) (string, error) //获取文件md5值
 func Sha1(data string) string //获取sha1值
 func Sha256(data string) string //获取sha256值
 func Sha512(data string) string //获取sha512值