diff --git a/nbs/__init__.py b/nbs/__init__.py
index 223a060..d8fabf5 100644
--- a/nbs/__init__.py
+++ b/nbs/__init__.py
@@ -47,8 +47,9 @@ class NetBoxScanner(object):
         '''
         try:
             nbhost = self.netbox.ipam.ip_addresses.get(address=host[0])
-        except ValueError:
-            logging.error(f'duplicated: {host[0]}/32')
+        except ValueError as e:
+            logging.error(e)
+            logging.error(f'possibly duplicated: {host[0]}/32')
             self.stats['errors'] += 1
             return False
 
diff --git a/netbox-scanner.conf b/netbox-scanner.conf
index dc91170..9a5e694 100644
--- a/netbox-scanner.conf
+++ b/netbox-scanner.conf
@@ -1,4 +1,5 @@
 [NETBOX]
+# format => http(s)://IP:PORT
 address    = <server>
 token      = <token>
 logs       = logs/