grunt-watch when you create a new folder does not work

grunt-watch is being created using the program. A new added folder will not be found when it's added to the js directory.

If the file structure looks like the following:

  js/moduleA.js
  js/moduleB.js
  js/modules/moduleC.js

And glob pattern "**/*.js" if moduleB.js or moduleA.js or modules/moduleC.js module changes, it works fine.

However, grunt-watch running js folder under a new folder for the new folder is added, it does not recognize the watch.

   // Grunt watch running ....
   // create new_folder and create moduleD.js
   js/new_modules/moduleD.js <------ Even if it changes the watch does not work.    

Is the glob pattern wrong?