Hotkey for refreshing search results

[masaeedu]

Hi there. I'm trying to use ack.vim for doing a rename refactoring by finding all the places in the project where a particular symbol is referenced. After I do :Ack foo, I get all the results in the quickfix list.

After I've gone to the first file and fixed the problem, I want to be able to quickly refresh the list so that the stale entries that I've already fixed get removed. Can I add a shortcut like R in the quickfix buffer to refresh the search results?