diff --git a/src/documents/serialisers.py b/src/documents/serialisers.py
index c2f57581c..a42226267 100644
--- a/src/documents/serialisers.py
+++ b/src/documents/serialisers.py
@@ -1751,6 +1751,7 @@ class BulkEditSerializer(
     SetPermissionsMixin,
     SourceModeValidationMixin,
 ):
+    # TODO: remove this and related backwards compatibility code when API v9 is dropped
     LEGACY_FILE_METHOD_ENDPOINTS = {
         "rotate": "/api/documents/rotate/",
         "merge": "/api/documents/merge/",
diff --git a/src/documents/views.py b/src/documents/views.py
index 76a2269f0..55dacb473 100644
--- a/src/documents/views.py
+++ b/src/documents/views.py
@@ -2282,6 +2282,7 @@ class BulkEditView(DocumentOperationPermissionMixin):
     def post(self, request, *args, **kwargs):
         request_method = request.data.get("method")
         api_version = int(request.version or settings.REST_FRAMEWORK["DEFAULT_VERSION"])
+        # TODO: remove this and related backwards compatibility code when API v9 is dropped
         if request_method in BulkEditSerializer.LEGACY_FILE_METHODS:
             endpoint = BulkEditSerializer.LEGACY_FILE_METHOD_ENDPOINTS[request_method]
             logger.warning(