Maya wrote the answer eight months before she needed it — a line in a note called "client onboarding — things that go wrong," the kind of note you start after a launch goes sideways and then never think to open again. So when the same problem resurfaced on a new project, she didn't go digging for it; it surfaced on its own, at the bottom of the note she was already in, under a little heading that read Linked references. A backlink is the thing that carried it there: an automatic, reverse-direction signpost — when one note links to another, the second note quietly shows that the first one points to it.
You write the link once, going forward, and the connection shows up at both ends — for free, forever. That last part is the whole trick. Let's build up to why it matters, starting from the link you already know.
First, the link you already know: the forward link
You're writing a note and you mention another idea you've already captured — say a note called Decision Journal. So you link to it. In most modern notes apps you do that by wrapping the name in double brackets, [[Decision Journal]], and the app turns it into a clickable connection. That's a forward link: a pointer from the note you're in to the note you named. It works exactly like a link on a web page — click it, and you jump there.
Forward links are great. But they only run one way. The Decision Journal note has no idea anyone just linked to it. If links were only ever forward, every note would know where it's going and nothing would know where it's been pointed to from.
The reverse signpost: the backlink
Here's the move. The moment you write [[Decision Journal]] in today's note, a good app doesn't just draw the forward arrow — it also walks over to the Decision Journal note and adds a line to its Linked references (sometimes called "backlinks" or "mentions"): "This note is referenced by: today's note."
You did one action — wrote a link going out. The app gave you two: the link out, and a signpost pointing back. A backlink is just that return signpost, created automatically. You never maintain it. You never remember to add it. It's the bookkeeping the app does so you don't have to.
Why this quietly changes everything
Folders make you decide, up front, the one place a note lives. But ideas don't have one home — your Decision Journal note is relevant to investing, to that bad onboarding launch, to a book you read. With backlinks you don't have to choose. You link from wherever the thought naturally comes up, and the destination note slowly accumulates a list of every place it turned out to matter.
Do that for a few months and something appears that you never deliberately built: a web. Each note becomes a little hub that shows, at the bottom, everywhere it's connected. You stop filing information and start connecting it — which is much closer to how memory actually works. That web of linked notes is what people mean when they call their note collection a "second brain": not the pile of notes, but the connections between them.
A concrete example
Say you keep a note for each book you read. In your note on Thinking, Fast and Slow you jot: "reminds me of the [[Decision Journal]] idea." Months later, reading something else, you again write "[[Decision Journal]]."
Now open the Decision Journal note. You never edited it after creating it — but its Linked references section now lists both: the book note and the later one. Without lifting a finger, that note has become a map of every thought that ever orbited it. Maya's onboarding note found her the same way: a link she'd written toward it, months earlier, surfaced it back exactly when it counted.
Why it matters
Search finds a note when you already know you're looking for it. Backlinks do the harder thing: they surface a note when you've forgotten it exists, because you stumbled into its neighborhood. That's the difference between a drawer of notes you have to remember to open and a brain that hands things back to you. The notes you wrote months ago stop being buried — they start showing up to help.
Try this
Pick two notes you already have that relate to each other. Open one, type the other's name in double brackets — [[Note Name]] — and save. Now open the second note and scroll to the bottom: you'll see the first one waiting there, even though you never edited it. That's a backlink. In JustJot.ai, every [[link]] you write does this both ways automatically, so the more you connect, the more your notes start finding you.