How to keep track of line numbers in response to reviewers? I am working on resubmitting a paper to a journal and am working on my response to reviewers. I need to refer to a bunch of line numbers in my response to reviewers and it is frustrating because every time I make a change to my manuscript the line numbers change a bit.

For instance, say a reviewer writes: "you should use the word 'correlate' rather than 'co-occur' in line 243"
I would then reply. "'co-occur' was replaced with 'correlate' in line 245". Note the line number is now higher because I added a sentence to my paper. This is fine, but say I have a whole bunch of these lines, and then I decide to add one more sentence to the beginning of my paper. Right now, I would have to go through my response and update all of the line numbers. I feel like there must be a better way to keep track of these. Maybe with some sort of dynamic field or something in word or open office. Does anyone have a suggestion?
This is always a pain, but I find it's not actually hard to deal with, just somewhat tedious.  My method for doing so is rather low-tech: I keep a copy of the old document to be able to track the old line numbers, then leave all of the line numbers in the response as XXX until I am done with the revision.  Then, for each entry, you just cross-index in both places and write both line numbers, e.g., 


  'co-occur' was replaced with 'correlate' in line 245 [prev. 243]


For minor wording/grammar edits, however, I usually don't actually respond in such detail, but simplify both my life and the reviewers by just saying something like: "thank you, fixed"