diff --git a/README.md b/README.md
index 8378716..1380d76 100644
--- a/README.md
+++ b/README.md
@@ -24,6 +24,7 @@ This project is a front-end web UI of Oxygen Toolbox and needs to be used with t
 # Requires
 
 - Web Server (e.g. Nginx, Apache httpd)
+- [API of Oxygen Toolbox](https://github.com/FatttSnake/oxygen-api) (v1.0.0 and later versions)
 
 # Related projects
 
diff --git a/README_zh.md b/README_zh.md
index 352cae2..51308ed 100644
--- a/README_zh.md
+++ b/README_zh.md
@@ -24,6 +24,7 @@
 # 环境要求
 
 - Web 服务器（如 Nginx, Apache httpd）
+- [API of Oxygen Toolbox](https://github.com/FatttSnake/oxygen-api) (v1.0.0 及更高版本)
 
 # 关联项目