diff --git a/README.md b/README.md
index c47ccbb..23c5da1 100644
--- a/README.md
+++ b/README.md
@@ -7,5 +7,13 @@
 ## example usage
 
 ```
-certbot certonly --dry-run --manual --preferred-challenges=dns --manual-auth-hook ./certbot-dns-auth.sh -d example.com
+certbot certonly --dry-run --manual --preferred-challenges=dns --manual-auth-hook [path to this repositry]/certbot-dns-auth.py -d example.com
+```
+
+A file `conf.cfg` with inwx settings must e exist like:
+```
+[live]
+url = https://api.domrobot.com/xmlrpc/
+username = [USERNAME]
+password = [PASSWORD]
 ```
diff --git a/certbot-dns-auth.py b/certbot-dns-auth.py
new file mode 100755
index 0000000..3ca61a1
--- /dev/null
+++ b/certbot-dns-auth.py
@@ -0,0 +1,37 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+"""
+Created on Thu May 31 17:23:20 2018
+
+@author: Pascal Gollor (https://gitbucket.pgollor.de)
+"""
+
+
+import os, sys
+
+
+def main():
+	d = os.environ.get('CERTBOT_DOMAIN')
+	if (not d):
+		sys.exit('CERTBOT_DOMAIN not set!')
+	# end if
+
+	v = os.environ.get('CERTBOT_VALIDATION')
+	if (not v):
+		sys.exit('CERTBOT_VALIDATION not set!')
+	# end if
+
+	# check domain
+	if (d.count('.') > 1):
+		sys.exit('Subdomains not supported!')
+	# end if
+
+	dirName = os.path.dirname(os.path.abspath(sys.argv[0]))
+	cmd = dirName + "/update-record.py -c " + dirName + "/conf.cfg" + " -r TXT _acme-challenge." + d + " " + v;
+	os.system(cmd)
+# end main
+
+
+if __name__ == '__main__':
+	main()
+# end if
\ No newline at end of file
diff --git a/certbot-dns-auth.sh b/certbot-dns-auth.sh
deleted file mode 100755
index d919891..0000000
--- a/certbot-dns-auth.sh
+++ /dev/null
@@ -1,3 +0,0 @@
-#!/bin/bash
-
-python update-record.py -r TXT  _acme-challenge.${CERTBOT_DOMAIN} $CERTBOT_VALIDATION