diff --git a/BOILERPLATES.md b/BOILERPLATES.md
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+Any folder contained in [boilerplates](https://github.com/batijs/bati/tree/main/boilerplates) folder is considered a _boilerplate_.
+
+Each boilerplate may be related to one or multiple _features_.
+
+> [!NOTE]
+> `react`, `eslint`, `auth0`, etc. are each considered as _features_.
+> They are visible on the [website](https://batijs.dev/) and available through flags in the CLI.
+> They are defined in [features.ts](https://github.com/batijs/bati/blob/main/packages/features/src/features.ts).
+> On the CLI, each flag (i.e. `--solid`) enables the given feature.
+
+Some features are well contained in a dedicated boilerplate ([Cloudflare](https://github.com/batijs/bati/tree/main/boilerplates/cloudflare)),
+some others are [split](https://github.com/batijs/bati/tree/main/boilerplates/firebase-auth) [into](https://github.com/batijs/bati/tree/main/boilerplates/react-firebase-auth) [several](https://github.com/batijs/bati/tree/main/boilerplates/solid-firebase-auth) [ones](https://github.com/batijs/bati/tree/main/boilerplates/vue-firebase-auth).
+
+## Anatomy of a boilerplate
+
+> [!TIP]
+> Create a new boilerplate with `pnpm run new-boilerplate <name>`
+
+Each boilerplate contains at least:
+- `files` folder, which contains files that will be used by Bati CLI to scaffold a new app. This is where all code related to features must be placed.
+- `package.json`, with a special `bati` property, linking one or many _features_ (or the lack of) to the boilerplate. [More on that below](#packagejsonbati-condition).
+
+## How to keep code maintainable
+
+The most important thing is to avoid duplicating code as much as possible. And we have several tools to help us:
+- Split a _feature_ into multiple boilerplates if necessary, each with [different conditions](#packagejsonbati-condition)
+- Make use of [Bati's own templating syntax](https://github.com/batijs/bati/blob/main/boilerplates/README.md)
+- Use [special `$*.ts` filename syntax](#ts-files)
+
+One other important goal is to keep code safely typed. Thanks to Bati's [special syntax](https://github.com/batijs/bati/blob/main/boilerplates/README.md), mixing code and templating is usually straightforward.
+
+> [!TIP]
+> You can require boilerplates files from any other boilerplate. Use the special `@batijs/*` imports to achieve this.
+> For instance, importing `@batijs/trpc/trpc/server` imports the `boilerplates/trpc/files/trpc/server.ts` file. Typing information is conserved when doing so.
+> Upon scaffolding, those imports are replaced by relative ones.
+
+## `package.json#bati` condition
+
+All boilerplates `package.json` files contain a `bati` property, which dictates if the boilerplate is part of a _feature_.
+Most notably, the `bati.if` property leverages [sift](https://www.npmjs.com/package/sift) syntax to include or exclude said boilerplate depending on CLI flags.
+
+> [!TIP]
+> Take a look at existing boilerplates `package.json` for inspiration
+
+## `$*.ts` files
+
+`files/` folder can contain special `$*.ts` files which, contrary to other files which are [mostly](https://github.com/batijs/bati/blob/main/boilerplates/README.md) copied as-is,
+are interpreted.
+
+> [!NOTE]
+> When generating the proper filename of the destination file, the `$` and `.ts` parts are removed.
+> For instance, `$vite.config.ts.ts` is renamed `vite.config.ts`, or `$package.json.ts` is renamed `package.json`.
+
+Those files MUST export a default function which returns either a `string` or `undefined` (or some serializable object for `.json` files).
+If the function returns `undefined`, nothing happens (existing file is not altered, and no empty file is created).
+
+```ts
+// files/$vite.config.ts.ts
+
+// bati's utils
+import { addVitePlugin, loadAsMagicast, type TransformerProps } from "@batijs/core";
+
+// the exported default function, which always takes a `TransformerProps` as its first parameter.
+export default async function getViteConfig(props: TransformerProps) {
+  // Multiple `$*.ts` files can target the same file, here its target is `vite.config.ts`
+  // Some utils allows you access the already generated file, and modify it.
+  
+  // Here, `loadAsMagicast` loads previously created `vite.config.ts`, which always exists because defined in `boilerplates/shared/files`.
+  const mod = await loadAsMagicast(props);
+  // Other utils like this one exist:
+  // - `loadAsJson`: loads a JSON file and parses it
+  // - `loadReadme`: loads README file and provides utils to manipulate it
+  // - `props.readfile`: loads previous file as string if it exists
+
+  // Then we edit the AST to add a vite plugin
+  addVitePlugin(mod, {
+    from: "vite-plugin-compiled-react",
+    constructor: "compiled",
+    imported: "compiled",
+    options: { extract: true },
+  });
+
+  // Finally we return the updated code as a string
+  return mod.generate().code;
+}
+```
+
+> [!TIP]
+> Take a look at existing boilerplates for examples
+
+## Advanced rules
+
+Some _features_ could be incompatible with one another. For instance, `compiled` can only be used with `react`.
+To materialize those conflicts (or contextual information), Bati defines them in [packages/features/src/rules](https://github.com/batijs/bati/tree/main/packages/features/src/rules).
+
+- [enum.ts](https://github.com/batijs/bati/blob/main/packages/features/src/rules/enum.ts) uniquely identify a message shown by the CLI or the website
+- [rules.ts](https://github.com/batijs/bati/blob/main/packages/features/src/rules/rules.ts) where the logic behind each message is defined
+
+Each message should then be defined on the [website](https://github.com/batijs/bati/blob/main/website/components/RulesMessages.tsx) and on the [CLI](https://github.com/batijs/bati/blob/main/packages/cli/rules.ts).
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index a7d89f627..a3498cf3a 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -27,7 +27,7 @@ pnpm build # At the monorepo root
 
 <br/>
 
-## Create a new integration
+## Integrate a new feature
 ```shell
 # At the monorepo root
 
diff --git a/boilerplates/README.md b/boilerplates/README.md
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@@ -1,3 +1,6 @@
+> [!TIP]
+> `BATI` is a global available during the templating phase, which is a `Set` containing all chosen _features_
+
 ### Syntax
 
 Bati uses specific syntaxes to generate its boilerplates.