diff --git a/.env.example b/.env.example
new file mode 100644
index 0000000000000000000000000000000000000000..333b42d6c1afbb776d915f23deb530eef9f5e054
--- /dev/null
+++ b/.env.example
@@ -0,0 +1,4 @@
+MODOBOA_API_BASE=
+PDNS_API_BASE=
+MODOBOA_TOKEN=
+PDNS_TOKEN=
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000000000000000000000000000000000000..0a4393b688d2a57007b4817800f2322c7d651b1b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+.env
+.vscode
+.tmp
+venv
+
diff --git a/README.md b/README.md
new file mode 100644
index 0000000000000000000000000000000000000000..26d28f39829e433ded69ded608c9971e12ef76e2
--- /dev/null
+++ b/README.md
@@ -0,0 +1,47 @@
+# DNS IP changer
+
+## Preparations
+
+Explain how to set
+
+```
+MODOBOA_API_BASE=
+PDNS_API_BASE=
+```
+
+```
+MODOBOA_TOKEN=
+PDNS_TOKEN=
+```
+
+in `.env` from copying `.env.example`, and why.
+
+Eventually create a venv, pyenv, pipenv, ...
+
+Install requirements
+
+```
+pip3 install -U pip
+pip3 install -U requests python-dotenv
+```
+
+## Usage
+
+This tool helps to migrate DNS A records pointing at a certain IP to another one.
+
+```
+Usage:
+./pdns-api.py from-ip to-ip
+```
+
+## Related
+
+This work lives on in [modoboa-pdns-bridge.py · ecobytes / lab / mx](https://lab.allmende.io/ecobytes/lab/mx/-/blob/master/modoboa-pdns-bridge.py)
+
+## Authors
+
+- Johannes Winter
+
+## License
+
+© Ecobytes e.V.
diff --git a/pdns-api.py b/pdns-api.py
old mode 100644
new mode 100755
index 5dd2001f423b1ecde1fa8c9e433b309b6b307645..3eed7508c0670f53febdf64843dada9faa1bbcf1
--- a/pdns-api.py
+++ b/pdns-api.py
@@ -1,11 +1,13 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 ## imports
-import json
 import requests
 import os, sys
+import pprint
 
 ## loaders
+pp = pprint.PrettyPrinter(sort_dicts=True, indent=4)
+
 from dotenv import load_dotenv
 
 env_path = os.path.abspath ( os.path.join ( os.curdir, os.path.relpath('.env') ) )
@@ -41,14 +43,11 @@ def set_record(zone, name, type, record):
     ]
   }
   print ('payload')
-  pprint(payload)
+  pp.pprint(payload)
   p = requests.patch(PDNS_API_BASE + 'zones/' + zone, headers={'X-API-KEY': PDNS_TOKEN}, json=payload)
 
   print (p.text)
 
-def pprint(text):
-  print json.dumps(text, sort_keys=True, indent=4, separators=(',', ': '))
-
 def change_ip(record,ip):
   record['content']=ip
   set_record(record['zone'],record['name'],record['type'], record)
@@ -60,7 +59,7 @@ def change_records(a, b):
 
 
 if len(sys.argv) > 1:
-  [pprint(result) for result in search_pdns(sys.argv[1])]
+  [pp.pprint(result) for result in search_pdns(sys.argv[1])]
   if len(sys.argv) > 2:
     change_records(sys.argv[1], sys.argv[2])
 else: