The phrase "comment up on" is commonly misspelled as "comment upon", but the correct spelling is with the added preposition "up". The IPA phonetic transcription for "comment up on" would be /ˈkɒm.ɛnt ʌp ɒn/. The addition of "up" emphasizes the upward movement of the comment or the act of commenting on something which is positioned higher than the speaker. It is important to use correct spelling and grammar to clearly convey meaning and avoid misunderstandings.