Adding a value to Combo-Box with Query source

[Cavern]

I am trying to make a combo-box that determines the records shown in a list-box on my form (for navigation of a book database). The combo-box contains a list of all the categories that contain books using a SQL query. But I would like to add an 'any' category to the end. I just don't know how to get that to appear on the list as well.
Any help would be appreciated.

 

[dcx693]

See this Microsoft article: ACC: How to Add "(all)" to a Combo Box or List Box Control .