diff --git a/README.md b/README.md
index 14b6907..dbfe334 100644
--- a/README.md
+++ b/README.md
@@ -46,7 +46,7 @@ To start using DNS authentication for Core Networks, pass the following argument
 An example `credentials.ini` file:
 
 ```ini
-dns_corenetworks_login = myremoteuser
+dns_corenetworks_username = myremoteuser
 dns_corenetworks_password = verysecureremoteuserpassword
 ```
 
diff --git a/certbot_dns_corenetworks.egg-info/PKG-INFO b/certbot_dns_corenetworks.egg-info/PKG-INFO
index 2038be3..7e2db71 100644
--- a/certbot_dns_corenetworks.egg-info/PKG-INFO
+++ b/certbot_dns_corenetworks.egg-info/PKG-INFO
@@ -83,7 +83,7 @@ To start using DNS authentication for Core Networks, pass the following argument
 An example `credentials.ini` file:
 
 ```ini
-dns_corenetworks_login = myremoteuser
+dns_corenetworks_username = myremoteuser
 dns_corenetworks_password = verysecureremoteuserpassword
 ```
 
diff --git a/certbot_dns_corenetworks/dns_corenetworks.py b/certbot_dns_corenetworks/dns_corenetworks.py
index b7f8839..46f1993 100644
--- a/certbot_dns_corenetworks/dns_corenetworks.py
+++ b/certbot_dns_corenetworks/dns_corenetworks.py
@@ -43,7 +43,7 @@ class Authenticator(dns_common.DNSAuthenticator):
             "credentials",
             "Core Networks credentials INI file",
             {
-                "login": "API user name for Core Networks beta API. (See {0}.)".format(
+                "username": "API user name for Core Networks beta API. (See {0}.)".format(
                     ACCOUNT_URL
                 ),
                 "password": "Password for API user",