I must be missing something. I'm in the chapter titled "Key-Value Observing" in Cocoa Programming by Aaron Hillegass. 

I have inserted the code that enables the application to undo/redo adding and subtracting employees from RaiseMan. The application works however what I'm wondering is why is that when I link the "Add Employee" to the NSArrayController to the ADD method (using the .xib file) it calls 

```
- (void)insertObject:(Person *)p inEmployeesAtIndex:(int)index;

```

According to the Key-Value Coding, shouldn't the add method call?

```
- (void)addEmployeesObject:newEmployee;

```

I'm linking the 'add' method not the 'insert' method.