Updating an index (1)

Hi all,

I have a book for which I have created an index. After I created the index, I realised that there are additional page references I want to add using that word. Do I have to do it manually, or is there a way to add another page reference to that original word.

See attached screen shot, I want to add another page reference to the Barbara (Cousin) entry. 

Regards,

Steve