diff --git a/ietf/doc/serializers.py b/ietf/doc/serializers.py
index d5f7bddd05..da2054ee60 100644
--- a/ietf/doc/serializers.py
+++ b/ietf/doc/serializers.py
@@ -145,7 +145,7 @@ class Meta:
             "abstract",
         ]
 
-    @extend_schema_field(DocIdentifierSerializer)
+    @extend_schema_field(DocIdentifierSerializer(many=True))
     def get_identifiers(self, doc: Document):
         identifiers = []
         if doc.rfc_number: