diff --git a/certbot/certbot/_internal/plugins/manual.py b/certbot/certbot/_internal/plugins/manual.py
index 48bb62632..cc471230c 100644
--- a/certbot/certbot/_internal/plugins/manual.py
+++ b/certbot/certbot/_internal/plugins/manual.py
@@ -37,8 +37,8 @@ class Authenticator(common.Plugin):
         'is the validation string, and $CERTBOT_TOKEN is the filename of the '
         'resource requested when performing an HTTP-01 challenge. An additional '
         'cleanup script can also be provided and can use the additional variable '
-        '$CERTBOT_AUTH_OUTPUT which contains the stdout output from the auth script.'
-        'For both authenticator and cleanup script, on HTTP-01 and DNS-01 challenges,'
+        '$CERTBOT_AUTH_OUTPUT which contains the stdout output from the auth script. '
+        'For both authenticator and cleanup script, on HTTP-01 and DNS-01 challenges, '
         '$CERTBOT_REMAINING_CHALLENGES will be equal to the number of challenges that '
         'remain after the current one, and $CERTBOT_ALL_DOMAINS contains a comma-separated '
         'list of all domains that are challenged for the current certificate.')