Not every helpful detail fits neatly into a major category. Sometimes the useful information is a small explanation: which box contains spare parts, why a certain folder has an unusual name, or who knows the history of an object.
Additional information is a place for those details. It should still be organized enough that a reader can understand what each instruction is about.
Notice the questions people ask you
When someone asks “Where do you keep that?” or “Who handles this?”, consider whether the answer belongs in your guide. Repeated questions often reveal information you know automatically but have never explained.
You can also walk through your usual week. Think about the tasks and arrangements that might confuse someone taking over for a while. Do not add a detail just because it is unusual; add it because it could help.
Give each detail its own title
“Spare parts for the bookshelf” is easier to find than an instruction titled “Miscellaneous.” Explain the relevant location and any useful context. If the detail belongs clearly in another category, put it there instead.
A fictional example: “The small box marked Shelf parts is in the hall cupboard. It contains the spare brackets for the living room bookshelf.” There is no need for a long story if one sentence answers the practical question.
Keep it from becoming a catch-all
A large pile of unrelated notes can be hard to use. Occasionally review this category and move entries that now fit somewhere else. Combine duplicate information when doing so would make it clearer, but keep separate tasks distinct.
Do not use this section to store confidential information that you have excluded from other categories. The same precautions apply throughout the guide: no passwords, PINs, full account numbers, or other private credentials.
The small details can be the most personal part of a practical guide. Choose the ones that would help someone feel less lost, and give each one a clear name and an understandable explanation.