diff --git a/ZeroSSL.com-CA.md b/ZeroSSL.com-CA.md
index c7e6e89..f293bb3 100644
--- a/ZeroSSL.com-CA.md
+++ b/ZeroSSL.com-CA.md
@@ -7,6 +7,12 @@ Alternatively you can create account and grab your acme creditentals faster on [
 
 https://zerossl.com/letsencrypt-alternative/#acme
 
+Note:
+    From acme.sh v3.0.0, acme.sh is using Zerossl as default ca, you must register account first(one-time) before you can issue a new certs.
+ 
+
+
+
 ### 1.  Register your account with an email address:
 
 ```