diff --git a/BuyPass.com-CA.md b/BuyPass.com-CA.md
index 54c56f1..8b5b3e3 100644
--- a/BuyPass.com-CA.md
+++ b/BuyPass.com-CA.md
@@ -1,6 +1,6 @@
 See https://github.com/Neilpang/acme.sh/pull/1989
 
-Thanks to  www.buypass.com
+Thanks to  [www.buypass.com](https://www.buypass.com/)
 
 https://www.buypass.com/ssl/resources/go-ssl-technical-specification