diff --git a/Documents/Resources/资源网站.md b/Documents/Resources/资源网站.md
index e8af95f..a3c7ff0 100644
--- a/Documents/Resources/资源网站.md
+++ b/Documents/Resources/资源网站.md
@@ -63,6 +63,8 @@
 - [SnapEDA PCB 零件查找器](https://www.rs-online.com/designspark/snapeda-parts-finder-cn#/)
 - [Ultra Librarian PCB 零件查找器](https://www.rs-online.com/designspark/ultra-librarian-parts-finder-cn)
 - [在线转换文件](https://onlineconvertfree.com/zh/)
+- [RF Tools](https://rf-tools.com)
+- [LC 滤波器设计工具](https://rf-tools.com/lc-filter/)
 
 ## 2. 镜像网站