diff --git a/cellxgene_gateway/static/js/annotation.js b/cellxgene_gateway/static/js/annotation.js
index 7b1032d..cc29c2c 100644
--- a/cellxgene_gateway/static/js/annotation.js
+++ b/cellxgene_gateway/static/js/annotation.js
@@ -1,5 +1,5 @@
 // neandertal javascript
-// TODO: rewrite this --
+// Annotations only work with file itemsources at the moment. If they work with others in the future we may need to revisit this.
 const new_annotation_callback = (() =>{
     const suffix = `.csv`;
     return (e) => {