Notes - How do I add custom module to "Relate to"

Hi.

I have created a custom module called visits.

When I go into the Notes module to add new notes, and I click Relate to, The Drop Down list does not include the new visits module I have created.

I guess somewhere in the Notes Module i will have to edit a file to add the new visits module to this drop down list? Can someone point me in the direction of the file I need to be looking at editing within the Notes Module to add this.

I’ve created a one2one, one2many, and many2many relationship between the two modules.

I wasn’t sure if I would find it in htdocs/custom/Extension/modules/Notes/Ext/Vardefs but I couldn’t see it in there.

Thanks.