Use certificate in NS1 plugin flag's help
diff --git a/certbot/cli.py b/certbot/cli.py
index 1023d9aca36..78e4032f13f 100644
--- a/certbot/cli.py
+++ b/certbot/cli.py
@@ -1247,7 +1247,8 @@ def _plugins_parsing(helpful, plugins):
                 help=('Obtain certificates using a DNS TXT record (if you are '
                       'using Google Cloud DNS).'))
     helpful.add(["plugins", "certonly"], "--dns-nsone", action="store_true",
-                help='Obtain certs using a DNS TXT record (if you are using NS1 for DNS).')
+                help=('Obtain certificates using a DNS TXT record (if you are '
+                      'using NS1 for DNS).'))
 
     # things should not be reorder past/pre this comment:
     # plugins_group should be displayed in --help before plugin
