diff --git a/lemur/plugins/lemur_acme/plugin.py b/lemur/plugins/lemur_acme/plugin.py
index 0baa0478..07324f35 100644
--- a/lemur/plugins/lemur_acme/plugin.py
+++ b/lemur/plugins/lemur_acme/plugin.py
@@ -98,7 +98,7 @@ class AcmeHandler(object):
         order,
         dns_provider_options,
     ):
-        current_app.logger.debug("Starting DNS challenge for {0}".format(target_domain))
+        current_app.logger.debug(f"Starting DNS challenge for {domain} using target domain {target_domain}.")
 
         change_ids = []
         dns_challenges = self.get_dns_challenges(domain, order.authorizations)