diff --git a/src/azul/service/avro_pfb.py b/src/azul/service/avro_pfb.py
index 3f689ec9a7..343ced674c 100644
--- a/src/azul/service/avro_pfb.py
+++ b/src/azul/service/avro_pfb.py
@@ -201,6 +201,8 @@ def for_replica(cls, replica: MutableJSON, schema: JSON) -> Self:
         # of AnVIL datasets have the same ID as the replica for the dataset
         # itself. Terra appears to combine PFB entities with the same ID
         # into a single row.
+        # FIXME: Improve handling of DUOS replicas
+        #        https://github.com/DataBiosphere/azul/issues/6139
         return cls(id=replica['entity_id'], name=name, object=object_)
 
     @classmethod