diff --git a/README.md b/README.md
index 7d69023..ef404ea 100644
--- a/README.md
+++ b/README.md
@@ -1621,7 +1621,8 @@ import "github.com/duke-git/lancet/v2/strutil"
     [[play](https://go.dev/play/p/HzLC9vsTwkf)]
 -   **<big>SubInBetween</big>** : return substring between the start and end position(excluded) of source string.
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#SubInBetween)]
-
+-   **<big>HammingDistance</big>** : calculates the Hamming distance between two strings.
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#HammingDistance)]
 
 <h3 id="system"> 22. System package contain some functions about os, runtime, shell command. &nbsp; &nbsp; &nbsp; &nbsp;<a href="#index">index</a></h3>
 
diff --git a/README_zh-CN.md b/README_zh-CN.md
index 03513b6..d50d431 100644
--- a/README_zh-CN.md
+++ b/README_zh-CN.md
@@ -1620,7 +1620,8 @@ import "github.com/duke-git/lancet/v2/strutil"
     [[play](https://go.dev/play/p/HzLC9vsTwkf)]
 -   **<big>SubInBetween</big>** : 获取字符串中指定的起始字符串start和终止字符串end直接的子字符串。
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/api/packages/strutil.md#SubInBetween)]
-
+-   **<big>HammingDistance</big>** : 计算两个字符串之间的汉明距离。
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/api/packages/strutil.md#HammingDistance)]
 
 <h3 id="system"> 22. system 包含 os, runtime, shell command 的相关函数。&nbsp; &nbsp; &nbsp; &nbsp;<a href="#index">回到目录</a></h3>
 
diff --git a/docs/api/packages/strutil.md b/docs/api/packages/strutil.md
index 909161d..95f190d 100644
--- a/docs/api/packages/strutil.md
+++ b/docs/api/packages/strutil.md
@@ -1500,7 +1500,7 @@ func main() {
 
 ### <span id="HammingDistance">HammingDistance</span>
 
-<p>TBD</p>
+<p>计算两个字符串之间的汉明距离。汉明距离是指对应符号不同的位置数。</p>
 
 <b>函数签名:</b>
 
diff --git a/docs/en/api/packages/strutil.md b/docs/en/api/packages/strutil.md
index b184c45..676a8bd 100644
--- a/docs/en/api/packages/strutil.md
+++ b/docs/en/api/packages/strutil.md
@@ -1502,7 +1502,7 @@ func main() {
 
 ### <span id="HammingDistance">HammingDistance</span>
 
-<p>HammingDistance calculates the Hamming distance between two strings. The Hamming distance is the number of positions at which the corresponding symbols are different</p>
+<p>HammingDistance calculates the Hamming distance between two strings. The Hamming distance is the number of positions at which the corresponding symbols are different.</p>
 
 <b>Signature:</b>