Adding txt files to your project

I have seen people add txt files to there project. Like over where it gives you a list of your forms and your modules in your project I have seen txt and when you look at the txt it actually will show it. The txt file goes in a folder called other documents or related documents can't remember which. I have tried to add a file and clicked on a txt but it always ends up puting it in the modules folder. Does anyone know how to do this? Thanks!!

When adding the file, check the "Add to Related Files" checkbox.

Thank you so very much!!!