borage - improves tomatoes?

Last year, I learned that borage (Borago officinalis L.) is not only a pretty flowering edible herb, but it also improves the flavor of tomatoes when grown within a few feet of them. I did plant some borage seeds, and they blossomed profusely. I don't know if it helped my tomatoes, since weather and other variables seem to be in control here. And, this year, the volunteer borage is coming up throughout the veggie garden.