diff --git a/inadyn/config.json b/inadyn/config.json
index 5a48b05..a530217 100755
--- a/inadyn/config.json
+++ b/inadyn/config.json
@@ -23,17 +23,17 @@
       {
         "provider": "str",
         "username": "str",
-        "password": "str",
+        "password": "str?",
         "hostname": "str",
-        "ssl?": "bool",
-        "user_agent?": "str",
-        "checkip_ssl?": "bool",
-        "checkip_server?": "str",
-        "checkip_command?": "str",
-        "checkip_path?": "str",
-        "custom_provider?": "bool",
-        "ddns_server?": "str",
-        "ddns_path?": "str"
+        "ssl": "bool?",
+        "user_agent": "str?",
+        "checkip_ssl": "bool?",
+        "checkip_server": "str?",
+        "checkip_command": "str?",
+        "checkip_path": "str?",
+        "custom_provider": "bool?",
+        "ddns_server": "str?",
+        "ddns_path": "str?"
       }
     ]
   }