diff --git a/services/filestore/app/js/FSPersistorManager.js b/services/filestore/app/js/FSPersistorManager.js
index c649dfb61b..1a9d2b824d 100644
--- a/services/filestore/app/js/FSPersistorManager.js
+++ b/services/filestore/app/js/FSPersistorManager.js
@@ -123,6 +123,7 @@ async function deleteFile(location, name) {
   }
 }
 
+// this is only called internally for clean-up by `FileHandler` and isn't part of the external API
 async function deleteDirectory(location, name) {
   const filteredName = filterName(name.replace(/\/$/, ''))