We're looking for long answers that provide some explanation and context. Don't just give a one-line answer; explain why your answer is right, ideally with citations. Answers that don't include explanations may be removed.
My answer had included a word to use ("fuming"), a link to Wiktionary, a quoted definition of the word, and a quoted example usage.
There was no comment explaining what in particular was missing, no indication (at least on the mobile web site) as to who added it (presumably tchrist based on the post history of the question), and no link to a question on meta describing what to check for.
Searching meta for "context" didn't get any hits about the "answer lacks context" template.