diff --git a/server/services/src/main/java/org/zanata/service/impl/MachineTranslationServiceImpl.java b/server/services/src/main/java/org/zanata/service/impl/MachineTranslationServiceImpl.java
index 7699956faf..d71331fd93 100644
--- a/server/services/src/main/java/org/zanata/service/impl/MachineTranslationServiceImpl.java
+++ b/server/services/src/main/java/org/zanata/service/impl/MachineTranslationServiceImpl.java
@@ -288,6 +288,7 @@ public Future<Void> prefillProjectVersionWithMachineTranslation(
             MTDocument result = getTranslationFromMT(mtDocument,
                     targetLocale.getLocaleId());
             saveTranslationsInBatches(next, result, targetLocale, saveState);
+            // TODO we only return the backendId from the final batch
             backendIdConfirmation = result.getBackendId();
             startBatch = batchEnd;
         }