diff --git a/src/azul/plugins/__init__.py b/src/azul/plugins/__init__.py
index 2b4b1a11a..37a8fb754 100644
--- a/src/azul/plugins/__init__.py
+++ b/src/azul/plugins/__init__.py
@@ -489,6 +489,8 @@ def verbatim_pfb_schema(self,
 
         :return: a list of PFB entity schemas describing the replicas
         """
+        # FIXME: Plugin modules are prone to circular imports
+        #        https://github.com/DataBiosphere/azul/issues/5683
         from azul.service import (
             avro_pfb,
         )
diff --git a/src/azul/plugins/metadata/anvil/indexer/transform.py b/src/azul/plugins/metadata/anvil/indexer/transform.py
index c3373cb40..32a159c55 100644
--- a/src/azul/plugins/metadata/anvil/indexer/transform.py
+++ b/src/azul/plugins/metadata/anvil/indexer/transform.py
@@ -422,6 +422,8 @@ def _only_dataset(self) -> EntityReference:
 
     @cached_property
     def _activity_polymorphic_types(self) -> AbstractSet[str]:
+        # FIXME: Plugin modules are prone to circular imports
+        #        https://github.com/DataBiosphere/azul/issues/5683
         from azul.plugins.metadata.anvil import (
             anvil_schema,
         )