Added a comment

Author: maneesht

packages/storage/test/unit/task.test.ts

@@ -400,6 +400,8 @@ describe('Firebase Storage > Upload Task', () => {
     // Promise for when we are finally in the pause state
     const pausedStateCompleted = new Deferred();
     let complete = 0;
+    // Adds a callback for when the state has changed. The callback resolves the pausedStateCompleted promise
+    // to let our await know when to resume.
     function addCallbacks(task: UploadTask): void {
       let lastState: string;
       task.on(