diff --git a/BuyPass.com-CA.md b/BuyPass.com-CA.md
index 23b7742..7556ed2 100644
--- a/BuyPass.com-CA.md
+++ b/BuyPass.com-CA.md
@@ -1,9 +1,19 @@
 See https://github.com/Neilpang/acme.sh/pull/1989
 
+Thanks to  www.buypass.com
+
+https://api.buypass.com/acme/directory
+https://www.buypass.com/ssl/resources/go-ssl-technical-specification
+
 
 Usage:
 
 ```sh
 acme.sh --server https://api.buypass.com/acme/directory  \
          --issue -d example.com -d www.example.com .....
-```
\ No newline at end of file
+```
+
+
+1. It only supports ACME v1,  no wildcard cert.
+2. It has 180 days lifetime.
+