Both could be used although on is more likely and formal in this case. You comment about means that you were generally talking about something. Your comment on = is on the subject of....
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Dave PhillipsBoth could be used although on is more likely and formal in this case. You comment about means that you were generally talking about something. Your comment on = is on the subject of....Thanks dave, got the point. Their same meaning "on the subject/topic of" was creating the confusion that's why I asked. But, after your answer, my doubt has cl