diff --git a/src/index.ts b/src/index.ts
index af68add..85b9bd1 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -51,6 +51,8 @@ const plugin: JupyterFrontEndPlugin<void> = {
         const content = new CounterWidget(browserFactory, theme);
         const widget = new MainAreaWidget<CounterWidget>({ content });
 
+        console.log('JupyterLab extension jupyterlab_mol_visualizer is activated!');
+
         // Watch for theme changes
         themeManager.themeChanged.connect((_, args) => {
           const newTheme = args.newValue;