Google documents an up-rank in Top Stories and a badge in AI answers. Those are not the same promise.
Google updated its preferred sources guidance for publishers on 20 August, and the advice that spread afterwards settled on one sentence: add a button and AI will show you more. The documentation says something more precise. For Top Stories, content is “more likely to appear”. For AI Mode and AI Overviews, content “can be highlighted with a ‘preferred’ badge”. One changes whether you appear and the other changes how you look once you are already there. Underneath both sits a feature that can only ever act on readers who already know your name.
Google updated its preferred sources guidance for publishers on 20 August, and the version of it that has spread on LinkedIn since has settled on a single sentence: add a button to your site and AI will show you more.
Google's documentation supports part of that. It does not support all of it, and the part it does not support is the part being quoted most.
What the documentation says, in Google's words
The guide for web publishers describes what happens when a reader selects a site as a preferred source. It describes two surfaces, and it describes them differently.
| Surface | Google's wording | What it promises |
|---|---|---|
| Top Stories | content is “more likely to appear”, highlighted with a “preferred” badge | a visibility change |
| AI Mode | content “can be highlighted with a ‘preferred’ badge” for users who have selected your site | a display change |
| AI Overviews | same sentence, same surface treatment | a display change |
| Discover | not mentioned in the publisher guide | not stated |
Read those twice. The first promises a change in whether you appear. The second promises a change in how you look once you are already there. One is a visibility outcome and the other is a display treatment, and Google has chosen its words carefully enough that the difference is unlikely to be accidental.
That does not make the AI half worthless. A trust marker attached to your name inside an AI answer earns its place, particularly in a format where readers have very little else to go on when deciding which of three cited sources to believe. But it is not the same claim as being cited more often, and anyone budgeting against the second claim is budgeting against something Google has not written down.
We should be clear about the limits of our own reading here. Absence from the documentation is not evidence of absence from the ranking system. Google may well surface preferred sources more frequently in AI answers. The point is narrower: as of 20 August, it does not say so, and a sentence Google has not written is not a finding.
Not every site can be chosen
The eligibility rule is the practical trap in all of this, and it is getting almost no attention.
Google's guidance: “Only domain-level and subdomain-level sites are eligible to appear in the source preferences tool.” A subdomain such as code.example.com qualifies. A subdirectory such as example.com/blog does not.
For most businesses that is fine, because they own the domain their content sits on. It matters enormously for anyone whose publishing lives one level down on somebody else's estate. If your best work is on a platform, a marketplace, a group site or a partner's domain, the thing a reader can select is that domain. You would be building preference for your landlord.
Give this ten minutes before you do anything else. Find where your content actually resolves. If it is a subdirectory of a domain you do not control, nothing else in this article applies to you yet, and that is a more useful thing to learn now than in six months.
How a publisher invites it
Google documents three methods. The standard one is close to trivial: a script tag, and a div carrying the google-add-preferred-source-btn attribute. There is an advanced JavaScript route for programmatic control, and a plain deeplink of the form google.com/preferences/source?q= followed by your URL, which is useful in an email, a newsletter footer or a social post where you cannot run script.
The implementation is genuinely a small job. It is closer to adding an analytics snippet than to a project, and the advice circulating that you should paste Google's page into a chatbot to work out how to install it rather overstates the difficulty of two lines of HTML.
Google adds its own limiting sentence, which almost nobody is quoting: “It's not required to do them in order to appear as a preferred source.” The button is a prompt. Readers can already choose you without it. What the button changes is how many of them think to.
The figures, and where they actually come from
Two numbers travel with this story and both trace back to the same place, which is not the documentation. Nick Fox, Google's senior vice president of knowledge and information, said on LinkedIn in December 2025 that people are twice as likely to click through to a site after marking it as a preferred source. He repeated the figure in April 2026 when the feature went global, and gave a count of nearly 90,000 unique sources selected during the testing period that ran from August to December 2025.
A named Google executive on the record is a real source, and that click-through figure is the strongest argument anyone has made for doing this. Two things to hold alongside it: that claim lives in a LinkedIn post and has never made it into the documentation, Google has not published the method behind it, and a doubling measured on people who have just deliberately chosen you is close to what you would expect before any product feature does anything at all.
A third number, a count of around 345,000 sources selected since launch, appears widely but we could not trace it to Google. We are leaving it out.
There is one genuine discrepancy worth flagging. Google's publisher documentation does not mention Discover at all, while Search Engine Journal's report on the April global rollout attributes it. Both may be true at different moments, since the feature has moved quickly. We are reporting what the current document says.
What this actually is
Strip the mechanics away and preferred sources is a preference expressed by somebody who already knows who you are.
A reader has to have read you, valued you enough to want more of you, and then taken a deliberate action to say so. Every part of that sequence happens after discovery. Preferred sources cannot introduce you to anyone. It makes you louder to people who already chose you once.
That is a real and underrated asset, and it is close to the opposite of the thing most businesses are anxious about right now. The hard problem in AI search is being named to somebody who has never heard of you, in an answer you will never see, generated from sources you do not control. Preferred sources does not touch that problem. It rewards publishers who have already solved it.
Which is why we would file it as a retention lever, beside the newsletter signup. Judge it on repeat readership. If it is working, the people who already like you come back more often. That is a good outcome. It is just not the outcome the current retelling is promising.
What we would do this week
Check eligibility first, at domain level, and find out whether your site appears in the source preferences tool at all before spending time on a button nobody can press.
Add the button if you publish regularly and have an audience worth compounding. It costs two lines and it is the sort of small compounding asset that looks trivial for a year and then does not.
Put the deeplink where your existing readers are, which for most businesses means the newsletter. The people most likely to select you are the ones who already open your email.
Do not reallocate anything away from being findable in the first place. Nothing in this feature improves the odds that an AI names you to a stranger, and that remains the expensive problem.
Measure it as loyalty. Returning visitors, direct traffic, repeat opens. If you go looking for it in an AI visibility score, you will not find it, and you will draw the wrong conclusion about a feature that was doing its actual job perfectly well.
Ronnie has written up the practical side of setting this up, and what he got wrong first, on his own site.
Does becoming a preferred source improve AI Overviews visibility?
Google's publisher documentation says that in AI Mode and AI Overviews your content can be highlighted with a “preferred” badge for users who have selected your site. It describes a badge on those surfaces. For Top Stories, by contrast, it says content is “more likely to appear”. The two surfaces carry different wording and should be read separately.
Can any website become a preferred source?
Only at domain or subdomain level. Google states that a subdirectory such as example.com/blog is not eligible, while example.com and code.example.com are. If your content sits in a subdirectory of a domain you do not own, readers cannot select you specifically.
How do I add a preferred source button to my site?
Google documents three methods: a standard JavaScript implementation using a script tag and a div with the google-add-preferred-source-btn attribute, an advanced JavaScript route for programmatic control, and a deeplink to google.com/preferences/source with your URL as a parameter. Google also states the button is not required in order to appear as a preferred source.
Is preferred sources a ranking factor?
It is a preference set by an individual reader, and it applies only for that reader. Search Engine Journal reports that selections do not override relevance. It cannot make you visible to someone who has never chosen you.
How many people have selected a preferred source?
Nick Fox, Google's senior vice president of knowledge and information, said in December 2025 that nearly 90,000 unique sources had been selected during the test period that ran from August 2025. In the same announcement, and again in April 2026, he said people are twice as likely to click through to a site after marking it as a preferred source. Both figures come from LinkedIn posts and Google has not published the method behind them.
Should preferred sources change my AI search strategy?
Not materially. The feature acts on readers who already know you, so it compounds an audience you already have. The harder problem, being named by an AI to someone who has never heard of you, is untouched by it.