Add Item To Specific Menu in functions.php

Hello,

I’d like to add an item to the Main Menu (I have 2 menus on my theme) in my child theme’s function.php. I can add the item using:
`add_filter(‘wp_nav_menu_items’, ‘add_login_logout_link’, 10, 2);’

But it adds it to both menus. I want to specify which one it goes to.

Thanks, Tonya