Nobody buys a Joomla template because of its documentation. You buy it because the demo looks sharp, the slideshow glides, and you can already picture your client's logo in the header. Then the honeymoon ends. Three weeks later you are trying to figure out why the footer collapses on tablets, which of the forty module positions actually renders on the blog layout, and whether the template's own CSS or your override is winning a specificity fight at two in the morning.
That is the moment documentation stops being a checkbox on a sales page and becomes the difference between a ten-minute fix and a lost afternoon. We have maintained Joomla sites long enough to say this plainly: a mediocre template with excellent documentation will cost you less over the life of a site than a gorgeous template with none.
This article covers what good template documentation actually looks like, how to work with a template that shipped with nothing but a ZIP file and good intentions, and how to write your own internal docs so the next person who touches the site — possibly future you — does not have to reverse-engineer everything from scratch.
Why documentation beats screenshots
A demo site answers one question: what can this template look like when someone who built it spends a week styling sample content? It says nothing about how you get from a blank install to that result, and it says even less about maintaining the thing for five years.
Documentation answers the questions that actually determine your cost of ownership. Where do I put a module so it appears above the content on every page except the homepage? Which template parameters are safe to change and which will fight the CSS? What happens to my customizations when version 2.4 arrives? A screenshot cannot answer any of that, and neither can a live demo, however pretty.
There is also a signal buried in the docs themselves. A developer who takes the time to document positions, parameters, and update procedures is a developer who plans to be around next year. Abandoned templates almost always had thin documentation to begin with — the neglect starts early and shows.
What good template documentation covers
Not every template needs a hundred-page manual. But there is a core set of topics that separates real documentation from a marketing PDF with the word "docs" in the filename.
A module position map
The single most valuable page in any template documentation is a diagram showing every module position and where it renders. Good docs show the positions overlaid on the actual layout — header here, three collapsible columns there, a hidden debug position at the bottom. Great docs also note which positions collapse when empty and which reserve space regardless. If your template lacks this map, you can build one yourself; our guide on how to find template module positions in Joomla walks through the whole process.
Template parameters, explained
Most modern templates expose parameters in the template style settings: logo upload, color scheme, layout width, font choices, sticky header toggles. Good documentation lists every parameter, what it does, and — critically — what it interacts with. "Enabling boxed layout disables the full-width slideshow position" is one sentence that saves an hour of confused clicking.
Override and customization notes
Documentation should tell you the sanctioned way to customize. Does the template load a user.css or custom.css file automatically? Which core outputs does it already override in its html folder, so you know not to duplicate them? If you plan to add your own layout regions later, notes on the template structure make jobs like adding a new module position far less risky.
The update path
How do updates arrive — through the Joomla updater, a package you install over the top, or a manual file replacement? Which files are safe to edit and which get overwritten on update? A template that overwrites custom.css during updates is a template that will eventually eat somebody's work, and you want to know that before it happens.
A changelog
An honest changelog tells you what changed, when, and why. It is how you decide whether an update is urgent (security fix in a bundled library) or optional (new demo style). No changelog usually means no discipline, and no discipline eventually means breakage.
A quick quality checklist
When you evaluate a template's documentation before buying or committing, run down this list:
- Is there a visual module position map, not just a list of position names?
- Are all template parameters described, including interactions between them?
- Is there a documented, update-safe way to add custom CSS and overrides?
- Does the changelog show regular, dated releases?
- Are the supported Joomla versions stated clearly, including plans for the next major release?
- Is the demo content installation documented (sample data, required extensions)?
- Are bundled third-party extensions listed with their versions?
Five or more solid answers and you are in good hands. Two or fewer and you should price in the hours you will spend figuring things out alone.
Working with an undocumented template
Sometimes the choice is out of your hands. You inherit a site, the vendor vanished, or a stakeholder already bought the template. The good news is that a Joomla template is not a black box — it documents itself if you know where to look.
Start with templateDetails.xml
Every valid Joomla template ships a templateDetails.xml file in its root folder. It declares the template's name, version, author, every file and folder it includes, all module positions, and the configurable parameters with their defaults. Reading it takes ten minutes and gives you the skeleton of the documentation the vendor never wrote. The positions section alone tells you every region name the template registers, even the ones no menu of the demo ever used.
Read index.php like a floor plan
The template's index.php is where positions become real. Each jdoc:include statement is a spot where Joomla injects module output or the component area. Trace the file top to bottom and you get the render order: which positions sit inside the header wrapper, which columns share a row, which regions are wrapped in conditionals that skip empty positions entirely. If a position appears in the XML but not in index.php, it exists in name only and will never render — a surprisingly common trap.
Use the position preview
Enable Preview Module Positions in the Templates options, then load any front-end page with ?tp=1 appended to the URL. Joomla outlines every rendered position with its name overlaid. Do this on several page types — homepage, article view, blog layout — because positions can appear or vanish depending on what else is published around them.
Writing your own internal documentation
If you build client sites, documentation is not optional even when the vendor's docs are excellent, because the vendor documents the template while you need to document the site. Those are different things. The vendor does not know that you assigned the promo module only to the landing pages, or that the custom HTML module in the footer contains the legally required disclaimer that must never be unpublished.
Our internal template doc for every client site fits on two or three pages and covers:
- Template name, version, license, and where the original package is archived.
- The position map for this site — which positions are in use and by which modules.
- Every file we changed or added, with a one-line reason for each.
- Template style parameters we altered from defaults.
- The update procedure and any known gotchas from past updates.
Keep it in the project repository or the client's shared drive, not in one person's head. The document earns its keep the first time someone else has to do an emergency fix.
Questions to ask a vendor before buying
Sales pages answer the questions vendors want asked. Before purchase, send a short pre-sales message with the questions they did not answer. How the vendor responds is itself useful data — slow, vague answers before you pay rarely improve afterwards.
| Question | What the answer tells you |
|---|---|
| Is there a public module position map? | Whether basic layout work will be guesswork |
| Which files survive updates untouched? | Whether your customizations are safe long term |
| Which Joomla versions are supported, and what is the plan for the next major release? | Whether you are buying a future migration problem |
| Can I see the changelog for the past year? | Real maintenance cadence, not promised cadence |
| Are bundled extensions updated with the template? | Whether third-party components become security debt |
None of these are gotcha questions. A competent vendor answers all five in one short email. The same diligence applies whether you are evaluating a commercial club or one of the many free business Joomla themes floating around — free templates deserve the same scrutiny, arguably more.
Documentation as part of the update routine
Documentation is only trustworthy if it stays current. We fold a two-minute doc check into every template update: after updating, confirm the version number in the internal doc, note anything that broke or changed, and re-run the ?tp=1 preview if the changelog mentioned layout work. The official Joomla documentation is also worth a periodic skim, since core behavior around templates shifts between releases and vendor docs do not always keep pace.
That tiny habit compounds. A site with three years of honest update notes is a site anyone on the team can maintain. A site with none is a site only its original builder dares to touch — and original builders move on.
FAQ
The template I bought has no documentation at all. Do I have grounds for a refund?
That depends on the marketplace and the vendor's stated deliverables, but in practice refunds for missing docs are rare unless documentation was explicitly promised. A better first move is a polite support ticket asking the specific questions you need answered. Many small vendors will answer quickly even when they never wrote formal docs. If support is silent too, treat the purchase price as sunk and decide whether the reverse-engineering time is worth it or whether switching templates now is cheaper than switching later.
Where should template documentation live for a client site?
Somewhere the client and any future developer can reach without you: the project repository, the client's own cloud storage, or a page inside the site's admin area. Avoid keeping the only copy in a personal email thread or a freelancer's laptop. We also drop a short README into the template's own folder on the server pointing to the full document, because the template folder is the first place a new developer looks.
Is templateDetails.xml always accurate about module positions?
It is accurate about what the template registers, not about what actually renders. Vendors sometimes leave stale position names in the XML after redesigns, and occasionally use a position in index.php without declaring it. Treat the XML as the candidate list and the ?tp=1 preview plus a read of index.php as the verification. When the two disagree, the PHP is the truth.
How much internal documentation is too much?
If maintaining the document takes longer than the problems it prevents, it is too much. For most client sites, two to three pages covering versions, changed files, position usage, and update notes is the sweet spot. Screenshots of settings screens age badly and bloat the doc; a dated line of text saying what you changed and why almost never goes stale.
The bottom line
Template documentation is unglamorous, which is exactly why it is such a reliable quality signal. Vendors who document their work maintain their work. Before you buy, weigh the docs as heavily as the demo. After you buy, read templateDetails.xml and index.php so the template holds no surprises. And for every client site, write the two pages the vendor could not write for you — the record of what this particular site does with this particular template. It is the cheapest insurance policy in web development, and one day it will save a launch. For more Joomla fundamentals, our Joomla hub collects the rest of our guides in one place.