diff --git a/src/menu/views/ImportMenu.js b/src/menu/views/ImportMenu.js
index 266e9a11..d2595653 100644
--- a/src/menu/views/ImportMenu.js
+++ b/src/menu/views/ImportMenu.js
@@ -18,7 +18,7 @@ const ImportMenu = MenuBuilder.extend({
     // http://www.w3schools.com/jsref/prop_fileupload_accept.asp
     // for now we allow multiple files
     uploader.multiple = true;
-    uploader.addEventListener("change", function() {
+    uploader.addEventListener("change", () => {
       var files = uploader.files || [];
       return msa.u.file.importFiles(files);
     });
diff --git a/src/utils/file.js b/src/utils/file.js
index 0bda3745..0344603f 100644
--- a/src/utils/file.js
+++ b/src/utils/file.js
@@ -83,8 +83,10 @@ var funs =
       this.msa.g.config.set("url", "userimport");
       this.msa.g.trigger("url:userImport");
     } else if (type === "features") {
+      alert("Support for reading JalView files is limited. Please open a issue on github if you run into troubles");
       this.msa.seqs.addFeatures(objs);
     } else if (type === "newick") {
+      console.error("Loading Newick files is experimental. Please open a issue on github if you run into troubles");
       this.msa.u.tree.loadTree(() => {
         return this.msa.u.tree.showTree(file);
       });