diff --git a/dnsapi/README.md b/dnsapi/README.md
index 9f176c0..23620c4 100644
--- a/dnsapi/README.md
+++ b/dnsapi/README.md
@@ -1300,3 +1300,22 @@ See:  https://github.com/Neilpang/acme.sh/wiki/DNS-API-Dev-Guide
 # Use lexicon DNS API
 
 https://github.com/Neilpang/acme.sh/wiki/How-to-use-lexicon-dns-api
+
+
+## Use Core-Networks API to automatically issue cert
+
+First you need to login to your Core-Networks account to to set up an API-User.
+Then export username and password to use these credentials.
+
+```
+export CN_User="user"
+export CN_Password="passowrd"
+```
+
+Ok, let's issue a cert now:
+```
+acme.sh --issue --dns dns_cn -d example.com -d www.example.com
+```
+
+The `CN_User` and `CN_Password` will be saved in `~/.acme.sh/account.conf` and will be reused when needed.
+