diff --git a/README.rst b/README.rst
index 318756e..3e0e870 100644
--- a/README.rst
+++ b/README.rst
@@ -34,7 +34,7 @@ To start using DNS authentication for ispconfig, pass the following arguments on
 certbot's command line:
 
 ============================================================= ==============================================
-``--authenticator certbot-dns-ispconfig:dns-netcup``          select the authenticator plugin (Required)
+``--authenticator certbot-dns-ispconfig:dns-ispconfig``          select the authenticator plugin (Required)
 
 ``--certbot-dns-ispconfig:dns-ispconfig-credentials``         ispconfig Remote User credentials
                                                               INI file. (Required)
@@ -57,7 +57,7 @@ An example ``credentials.ini`` file:
 
    certbot_dns_ispconfig:dns_ispconfig_username = myremoteuser
    certbot_dns_ispconfig:dns_ispconfig_password = verysecureremoteuserpassword
-   certbot_dns_ispconfig:dns_ispconfig_endpoint = https://localhost:8080
+   certbot_dns_ispconfig:dns_ispconfig_endpoint = https://localhost:8080/remote/json.php
 
 The path to this file can be provided interactively or using the
 ``--certbot-dns-ispconfig:dns-ispconfig-credentials`` command-line argument. Certbot
diff --git a/certbot_dns_ispconfig/dns_ispconfig.py b/certbot_dns_ispconfig/dns_ispconfig.py
index 4d64c52..61d11a1 100644
--- a/certbot_dns_ispconfig/dns_ispconfig.py
+++ b/certbot_dns_ispconfig/dns_ispconfig.py
@@ -1,6 +1,7 @@
 """DNS Authenticator for ISPConfig."""
 import json
 import logging
+import time
 
 import requests
 import zope.interface
@@ -133,7 +134,7 @@ class _ISPConfigClient(object):
         :raises certbot.errors.PluginError: if an error occurs communicating with the ISPConfig API
         """
         self._login()
-        zone_id, zone_name = self._find_managed_zone_id(domain)
+        zone_id, zone_name = self._find_managed_zone_id(domain, record_name)
         if zone_id is None:
             raise errors.PluginError("Domain not known")
         logger.debug("domain found: %s with id: %s", zone_name, zone_id)
@@ -167,7 +168,7 @@ class _ISPConfigClient(object):
         :raises certbot.errors.PluginError: if an error occurs communicating with the ISPConfig API
         """
         self._login()
-        zone_id, zone_name = self._find_managed_zone_id(domain)
+        zone_id, zone_name = self._find_managed_zone_id(domain, record_name)
         if zone_id is None:
             raise errors.PluginError("Domain not known")
         logger.debug("domain found: %s with id: %s", zone_name, zone_id)
@@ -196,6 +197,7 @@ class _ISPConfigClient(object):
                 "zone": zone_id,
                 "ttl": record_ttl,
                 "update_serial": False,
+                "stamp": time.strftime('%Y-%m-%d %H:%M:%S'),
             },
         }
         return data
@@ -218,7 +220,7 @@ class _ISPConfigClient(object):
         logger.debug("delete with data: %s", data)
         result = self._api_request("dns_txt_delete", data)
 
-    def _find_managed_zone_id(self, domain):
+    def _find_managed_zone_id(self, domain, record_name):
         """
         Find the managed zone for a given domain.
 
@@ -228,7 +230,7 @@ class _ISPConfigClient(object):
         :raises certbot.errors.PluginError: if the managed zone cannot be found.
         """
 
-        zone_dns_name_guesses = dns_common.base_domain_name_guesses(domain)
+        zone_dns_name_guesses = [record_name] + dns_common.base_domain_name_guesses(domain)
 
         for zone_name in zone_dns_name_guesses:
             # get the zone id
diff --git a/setup.py b/setup.py
index bffd7c6..f100835 100644
--- a/setup.py
+++ b/setup.py
@@ -16,7 +16,7 @@ install_requires = [
 from os import path
 
 this_directory = path.abspath(path.dirname(__file__))
-with open(path.join(this_directory, "README.rst"), encoding="utf-8") as f:
+with open(path.join(this_directory, "README.rst")) as f:
     long_description = f.read()
 
 setup(