diff --git a/API.md b/API.md
index dac950905..fba3177ba 100644
--- a/API.md
+++ b/API.md
@@ -1,3 +1,5 @@
+<a href="https://github.com/siyuan-note/siyuan/blob/master/API_zh_CN.md">中文</a>
+
 * [Specification](#Specification)
     * [Parameters and return values](#Parameters-and-return-values)
     * [Authentication](#Authentication)
diff --git a/API_zh_CN.md b/API_zh_CN.md
index 72dfed54f..c184d315a 100644
--- a/API_zh_CN.md
+++ b/API_zh_CN.md
@@ -1,3 +1,5 @@
+<a href="https://github.com/siyuan-note/siyuan/blob/master/API.md">English</a>
+
 * [规范](#规范)
     * [参数和返回值](#参数和返回值)
     * [鉴权](#鉴权)