diff --git a/package.json b/package.json
index bc29765..6548eaf 100644
--- a/package.json
+++ b/package.json
@@ -43,7 +43,7 @@
     "test": "jest --coverage",
     "watch": "run-p watch:src watch:labextension",
     "watch:labextension": "jupyter labextension watch .",
-    "watch:src": "tsc -w"
+    "watch:src": "jlpm build:lib -w"
   },
   "dependencies": {
     "@jupyterlab/application": "^3.0.0",
diff --git a/src/notebookButton.tsx b/src/notebookButton.tsx
index d90a055..1b3de90 100644
--- a/src/notebookButton.tsx
+++ b/src/notebookButton.tsx
@@ -76,7 +76,7 @@ export class TourButton extends ReactWidget {
     const errors = this._manager.getNotebookValidationErrors(this._notebook);
 
     if (errors.length) {
-      title = this.translator.__('Errors');
+      title = `${this.translator.__('Tour Validation Errors')}: ${errors.length}`;
       icon = errorTourIcon;
     }
 
@@ -99,7 +99,7 @@ export class TourButton extends ReactWidget {
         {tourIds.length ? (
           <option value="ALL">{trans.__('Run all Tours')}</option>
         ) : (
-          <option>{trans.__('No Tours found in this Notebook')}</option>
+          <optgroup label={trans.__('No Tours found in this Notebook')}></optgroup>
         )}
         {tourIds.length ? (
           <optgroup label={trans.__('Notebook Tours')}>