FYI: I don't know about your language skills in general but https://en.wiktionary.org/wiki/commata#English. Point I want to make: Please stop correcting so many people in general on HN.
Edit: Yes, this was not a perfectly warranted criticism. Yes, I may come off as smug. It's my opinion that needing perfect english should not be a requirement to have a conversation about tech in general.
I often get the feeling that in an academic setting every native English speaker assumes that everyone needs to be perfectly conversational in his English but when asked which other languages they even tried to learn you often learn that the English native hasn't put considerable amount into learning something else. Again, did not want to offend anyone.
I personally do not get offended, I like to learn. Still, I often experience corrections by an English native which are simply not called for.