OK, more searching and I found this post: https://ttlc.intuit.com/community/tax-credits-deductions/discussion/form-1116-explanation-statement/...
Basically for me this amount came from a self-employment sheet I had filled out due to a 1099-MISC payment. So it might be a "Deductible part of Self Employment Tax" or other item like that. I used the comment just to move on, as I don't think the amount changes anything. It would just be nice if clicking it would tell you where it came from!
