osx - No folder platforms on Ionic project -

i've done following steps :

1. create ionic project command : run ionic start myapp tabs
2. add platform on ionic project command : ionic platform add ios, ionic platform add android
3. i can't find platforms folder on project structure
4. this project sructure :
   • bower.json
   • config.xml
   • gulpfile.js
   • hooks
   • ionic.project
   • package.json
   • readme.md
   • resources
   • scss
   • www

5. this ionic info :

   cordova cli: 5.4.1

   ionic cli version: 1.7.13

   ionic app lib version: 0.6.5

   ios-deploy version: 1.8.4

   ios-sim version: 5.0.6

   os: mac os x el capitan

   node version: v5.4.1

   xcode version: xcode 7.2 build version 7c68

my question : platforms folder ?

the platforms folder can't created when create project in directory : ~/documents/testing projects/ionic

i tried change directory : ~/documents/ionic, , working expected