diff --git a/spec/problems.schema.json b/spec/problems.schema.json
index bbf887aee65c2cf9a0943914753a097a76e699c5..c82502ad4727cf777827d64c88868ed7aef78d6f 100644
--- a/spec/problems.schema.json
+++ b/spec/problems.schema.json
@@ -19,9 +19,9 @@
         "type": "string"
       },
       "instance": {
-        "description": "Betroffener Teil der Übertragung. Mögliche Werte: `submission`, `metadata`, `data`, `attachment:` + UUID des Attachments oder `other`",
+        "description": "Betroffener Teil der Übertragung. Mögliche Werte: `submission`, `reply`, `metadata`, `data`, `attachment:` + UUID des Attachments oder `other`",
         "type": "string",
-        "pattern": "^(submission|metadata|data|attachment:.+|other)$"
+        "pattern": "^(submission|reply|metadata|data|attachment:.+|other)$"
       }
     },
     "required": [