The revisions list shows when a question was closed and who by but not why. This would make it useful to see the complete history of a question.
Clarification: I'm talking about the revisions list not the actual page that displays the question. On contentious questions the post can be closed an reopened several times but the reasons are missing from the revisions page. Here are a few examples:
- https://stackoverflow.com/revisions/184618/list
- https://stackoverflow.com/revisions/1003841/list
- https://stackoverflow.com/revisions/184618/list
Imported from: http://stackoverflow.uservoice.com/pages/1722-general/suggestions/209267-show-why-a-question-was-closed-in-the-revisions-list