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To be used when you know, or feel like, there are more tags to be added but don't know, or can't remember/find them.
More specifically, it should be kept until an image can be reasonably determined to be tagged to at least "Level 3" as per the howto:tag checklist.
Not to be used as an excuse for laziness; tag your uploads as best as you can.
Related:
Some specific requests that can be added.
- annotation request
- artist request
- character request
- commentary request
- copyright request
- mecha to identify
- source request
- translation request
Read the full article.
