Finding a note is only half the job. You also need to know whether you should still follow it. A notes app ought to let you mark instructions as outdated while keeping them readable, searchable and connected to whatever replaced them.
That's a small feature worth taking seriously. Our view is that a well-kept digital notebook should preserve the history of a decision without presenting every old decision as current advice. The distinction matters most for notes you return to occasionally, when you may have forgotten why you wrote them in the first place.
Imagine a household setup guide that says the printer belongs on one wireless network. You've since changed the setup and written a new guide. Keeping the first note could help explain an old configuration or an accessory you bought. But finding it before the replacement could send you through steps you deliberately abandoned. A clear notice on the old guide would tell you which instructions to follow.
Keep the note, change its status
An outdated label should do more than move a page into a different folder. I'd want it to appear beside the title in search, in a shared preview and at the top of the note itself. You shouldn't have to read to the last paragraph to discover that the instructions above it are no longer recommended.
There should also be room for one plain sentence explaining the change: “Use the new printer setup guide; this version covers the previous router.” Link directly to the replacement. Where there isn't one, say so. A warning that points nowhere is less useful than a warning that tells you what to do next.
This would leave the original writing intact. Replacing every sentence with the latest advice might make the page easier to use now, but it also removes the explanation of what someone previously did. For a personal notebook, either approach can be reasonable. The app should help you choose deliberately rather than make deletion the obvious way to prevent confusion.
The label must be reversible, too. You might retire the wrong version or discover that an old procedure still applies to a second device. Restoring the note to current status should be a visible, understandable change, especially when other people share it.
A review date is a question
An optional review date would be useful, but it shouldn't automatically declare a note wrong. A date passing cannot establish whether a packing list, a household instruction or a project plan is still accurate. It can only tell you that you intended to check.
I'd separate “needs review” from “outdated.” The first asks the owner to take another look. The second records a judgment someone has already made. That difference would let you keep a useful reminder without teaching readers to distrust everything older than a few months.
There is a cost to this idea: another status to maintain. A notebook can become an administrative chore if every scrap of writing needs a category, an owner and a review schedule. Nobody should have to certify a thought before saving it. These controls should stay optional and work best on a few important reference notes, rather than becoming a compulsory filing system.
For shared notes, I'd also want to know who marked the information outdated and why. That isn't a popularity vote or an accuracy guarantee. It gives the next reader someone to ask if the change doesn't make sense.
Try it on five notes
You can adopt the habit without changing apps. Choose five notes that contain instructions you still rely on. Read each as if someone had sent it to you without explanation. Is the intended device, project or situation clear? Can you tell which version you should use?
Where an instruction has been replaced, put “Outdated” at the beginning of its title and add a short explanation at the top. Link to the current note if your app supports it, or give its exact title. Keep useful background below that notice. Don't erase a record simply because you no longer want to follow it.
Then search for the task again. If the old note still looks like the best answer, strengthen the notice or make the current title easier to recognise. Stop after those five notes; you don't need to reorganise your entire library to make it more dependable.
The next time you change a procedure, update its old note as part of the same job. A clear replacement link is more useful than hoping you'll remember which instructions you meant to stop using.