Splitting up the .module file

Question

I wrote my first module which happens to be in Drupal 7. The module uses hook_menu to correlate URLs with three custom-coded, page call backs. These callback functions that construct the custom html are currently inside the .module file.

The file is getting a little long and I would like to put the three custom-coded page call backs into another file. My first attempt did not work this morning, I'm not sure what I did wrong...

1) Added this line to the .info file:

files[] = my_module.pages.inc

2) Placed the callbacks into my_module.pages.inc

What is wrong or missing in this approach?