diff --git a/README.md b/README.md
index 18725f1f7..e39616a52 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@ It's expected that the root hosted zone for the domain in question already exist
 1. Install the letsencrypt-s3front plugin
 
   ```
-  pip install letsencrypt-s3front
+  pip install letsencrypt-route53
   ```
 
 ### How to use it
diff --git a/letsencrypt_route53/authenticator.py b/letsencrypt_route53/authenticator.py
index 280a5bb55..95d24b0ab 100644
--- a/letsencrypt_route53/authenticator.py
+++ b/letsencrypt_route53/authenticator.py
@@ -36,7 +36,7 @@ class Authenticator(common.Plugin):
 
     def get_chall_pref(self, domain):
         # pylint: disable=missing-docstring,no-self-use,unused-argument
-        return [challenges.DNS]
+        return [challenges.DNS01]
 
     def perform(self, achalls):  # pylint: disable=missing-docstring
         responses = []
@@ -48,8 +48,8 @@ class Authenticator(common.Plugin):
         # provision the TXT record, using the domain name given. Assumes the hosted zone exits, else fails the challenge
         response, validation = achall.response_and_validation()
         r53 = boto3.client('route53')
-        logger.info("Doing validation for " + achall)
-        listResponse = r53.list_hosted_zones_by_name(DNSName=achall.chall.path[1:])
+        logger.info("Doing validation for " + response.domain)
+        listResponse = r53.list_hosted_zones_by_name(DNSName=response.domain)
         matches = listResponse.HostedZones;
         if matches.size != 0:
             logger.error("Route53 returned " + mathces.size + " matching hosted zones. Expected exactly one. Auth canceled.")
@@ -62,7 +62,7 @@ class Authenticator(common.Plugin):
                     {
                         'Action': 'UPSERT',
                         'ResourceRecordSet': {
-                            'Name': achall.chall.path[1:],
+                            'Name': achall.validation_domain_name(),
                             'Type': 'TXT',
                             'TTL': 300,
                             'ResourceRecords': [