Usually a comment starts with /* and ends with */. In Greenfoot, this works obviously. Here in the discussion, it does not work as it should. If there is more than one */ in one line, only the last one is used.
Using /** ... */ works:
Just in case you see it differently:
Screenshot
no comment /* ←comment→ */ should be no comment /* ←comment→ */ no comment
no comment /** ←comment→ */ no comment /** ←comment→ */ no comment
