diff --git a/src/dns-challenge-schema.json b/src/dns-challenge-schema.json
index 6defbdd..39ac2ba 100644
--- a/src/dns-challenge-schema.json
+++ b/src/dns-challenge-schema.json
@@ -188,6 +188,10 @@
          "INWX_User" : {
             "description" : "The INWX username",
             "type" : "string"
+         },
+         "INWX_Shared_Secret" : {
+            "description" : "The INWX shared secret",
+            "type" : "string"
          }
       },
       "name" : "INWX"