diff --git a/crates/milli/src/update/new/indexer/document_operation.rs b/crates/milli/src/update/new/indexer/document_operation.rs
index 3be6cc080..7beffc7fc 100644
--- a/crates/milli/src/update/new/indexer/document_operation.rs
+++ b/crates/milli/src/update/new/indexer/document_operation.rs
@@ -94,6 +94,7 @@ impl<'pl> DocumentOperation<'pl> {
                     while let Some(document) =
                         iter.next().transpose().map_err(UserError::SerdeJson)?
                     {
+                        // TODO Do not allocate when it is not necessary
                         let external_document_id = primary_key.extract_fields_and_docid(
                             document,
                             new_fields_ids_map,
@@ -198,6 +199,7 @@ impl<'pl> DocumentOperation<'pl> {
         };
 
         // And finally sort them
+        // TODO Can we sort in parallel?
         docids_version_offsets.sort_unstable_by_key(|(_, (_, docops))| sort_function_key(docops));
         let docids_version_offsets = docids_version_offsets.into_bump_slice();
         Ok(DocumentOperationChanges {