Proofreading is the process of reading a manuscript one last time to catch any errors, grammatical or formatting, that might have been missed in all the edits before. No editor is perfect and everyone misses a handful of small things. A proofreading pass ensures that these small things will be caught by a new pair of eyes. 

I will proofread your document using Microsoft Word's Track Changes and the Chicago Manual of Style. If necessary, I'll also include a short editorial letter explaining in more detail the changes I recommended, however this might not be needed.