diff --git a/spec/authentication-tags.schema.json b/spec/authentication-tags.schema.json
index 31b8c18128e0ba2eaef2d56fe0e5f22dd4a2378a..bdb9b163700555811ebc32a87852dc25991f9b50 100644
--- a/spec/authentication-tags.schema.json
+++ b/spec/authentication-tags.schema.json
@@ -19,6 +19,7 @@
       "additionalProperties": false
     }
   },
+  "additionalProperties": false,
   "required": [
     "metadata"
   ]
diff --git a/spec/set-payload.schema.json b/spec/set-payload.schema.json
index f305ff103354af6ec76b2094b7507ff484bc7b89..7b69547c28ae87ebc3a2f8dc4ea56f576305744b 100644
--- a/spec/set-payload.schema.json
+++ b/spec/set-payload.schema.json
@@ -1,6 +1,6 @@
 {
-  "title": "Event",
-  "description": "Event.",
+  "title": "Security Event Token (SET)",
+  "description": "Security Event Token (SET) nach RFC 8417",
   "type": "object",
   "properties": {
     "version": {
@@ -86,14 +86,16 @@
             "authenticationTags"
           ]
         },
-        "https://schema.fitko.de/fit-connect/events/ delete-submission": {
+        "https://schema.fitko.de/fit-connect/events/delete-submission": {
           "type": "object"
         }
       },
+      "additionalProperties": false,
       "minProperties": 1,
       "maxProperties": 1
     }
   },
+  "additionalProperties": false,
   "required": [
     "version",
     "jti",