diff --git a/README.md b/README.md
index bd85901..7f17d58 100644
--- a/README.md
+++ b/README.md
@@ -27,6 +27,10 @@
 ## 4. 聯絡我們
   - 綠界技術服務工程師信箱: techsupport@ecpay.com.tw
 
+### 5.版權宣告
+
+* License: GPLv2 or later
+* License URI: https://www.gnu.org/licenses/gpl-2.0.html