diff --git a/tools/tools.md b/tools/tools.md
index 41acf56..b0271ca 100644
--- a/tools/tools.md
+++ b/tools/tools.md
@@ -10,3 +10,7 @@
 
 ![P](https://github.com/buunguyen/octotree/raw/master/docs/chrome-github.png)
 
+[f.lux](https://justgetflux.com/)
+
+根据地区和时间调节屏幕亮度，缓解眼睛压力
+