Adding to the Object Menu

Can someone please tell me the correct way to add an item to a menu other then the Add menu?
I’ve been all over the web but I’m not sure exactly what I’m looking for.
I created an addin but I’d like to have it available off the Object menu and not the Add menu.

See in this book, there is a chapter about adding command to Blender menu

Thanks so much!
Found it: bpy.types.VIEW3D_MT_object