diff --git a/README.md b/README.md
index 24a3259..7b4a50d 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,8 @@
   <img alt="OneWorks Avatar — a growing gallery of geometric 3D avatars and pixel styles" src=".github/assets/avatar-cover-light-en.jpg" width="1600">
 </picture>
 
+This cover automatically follows your system’s light or dark color scheme.
+
 Create, animate, and export a geometric 3D avatar directly in your browser.
 
 ## Quick start
diff --git a/README.zh-Hans.md b/README.zh-Hans.md
index 3100b9c..318158f 100644
--- a/README.zh-Hans.md
+++ b/README.zh-Hans.md
@@ -8,6 +8,8 @@
   <img alt="OneWorks Avatar——不断扩展的几何 3D 头像与像素风格" src=".github/assets/avatar-cover-light-zh-Hans.jpg" width="1600">
 </picture>
 
+此封面会自动跟随系统的浅色或深色配色方案。
+
 直接在浏览器中创建、制作动画并导出几何 3D 头像。
 
 ## 快速开始