Add comments to indicate value gotten by subtraction

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Unit Test Results :rocket:

457 tests  ±0   457 :white_check_mark: ±0   1m 35s :stopwatch: +7s   1 suites ±0     0 :zzz: ±0    1 files   ±0     0 :x: ±0 

Results for commit 9a73a513. ± Comparison against base commit 4ecdace1.