diff --git a/src/toolbar/actions.js b/src/toolbar/actions.js
index 7016030..397c66d 100644
--- a/src/toolbar/actions.js
+++ b/src/toolbar/actions.js
@@ -1,5 +1,10 @@
 import * as t from './actionTypes';
 
+/**
+ * Creates a Redux action to handle a toolbar button click.
+ * @param {string} id - The id of the button that was clicked.
+ * @returns {{type: string, id: string}} A CLICK_BUTTON action object.
+ */
 export const clickButton = (id) => ({
     type: t.CLICK_BUTTON,
     id