diff --git a/README.md b/README.md
index 72b65a9..ed6aea1 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,10 @@
 
 A professional pedigree (family tree) drawing tool for genetic counselors and bioinformatics professionals.
 
+## Online Demo
+
+https://gbanyan.github.io/pedigree-draw/
+
 ## Motivation & Background
 
 This project is created by an author with Usher syndrome.
diff --git a/README.zh-TW.md b/README.zh-TW.md
index a6c9bbb..9bb8af4 100644
--- a/README.zh-TW.md
+++ b/README.zh-TW.md
@@ -4,6 +4,10 @@
 
 專為遺傳諮詢師和生物資訊專業人員設計的 Pedigree（家族樹）繪圖工具。
 
+## 線上 Demo
+
+https://gbanyan.github.io/pedigree-draw/
+
 ## 動機與背景
 
 本專案由一位患有 Usher syndrome 的作者所建立。