diff --git a/README.md b/README.md
index 1961af0..fa89abe 100644
--- a/README.md
+++ b/README.md
@@ -17,35 +17,107 @@ Visit <https://cosma.arthurperret.fr> to learn more about the software.
 - [Getting started](https://cosma.arthurperret.fr/getting-started.html)
 - [User manual](https://cosma.arthurperret.fr/user-manual.html)
 
-## Install
+## Commands
+
+### Install
+
+Need NodeJs v.18 or later.
+
+You want to install app on your computer:
+
+```bash
+npm i @graphlab-fr/cosma --global
+cosma --help # enjoy
+```
+
+You want to install app on your own project ([see exemple](https://github.com/Myllaume/cosmoscope-generator)):
+
+```bash
+npm i @graphlab-fr/cosma
+npx cosma --help
+# or
+./node_modules/.bin/cosma cosma --help
+```
+
+You have dowloaded this repository and want to execute app:
 
 ```bash
-npm i # install dependences + build JS files
+npm i # install dependences + build executable file
+node dist/back.cjs # execute app
 ```
 
-## Development
+### Development
+
+You want build executable each time you edit files:
 
 ```bash
 npm run watch:front # build web browser script
 npm run watch:back # build NodeJs executable file
-nodemon --ext css,njk,js,cjs --watch dist/ --watch static/ --exec "sh e2e/exec-modelize.sh" # make cosmoscope files for dev or E2E testing
+
+# install nodemon and export files when executable change
+nodemon --ext css,njk,js,cjs --watch dist/ --watch static/ --exec "sh e2e/exec-modelize.sh"
+```
+
+You want build production app and export files with:
+
+```bash
+npm prepare
+sh e2e/exec-modelize.sh
+```
+
+## Maintenance
+
+The software is written in JavaScript. Uses ESM.
+Code is documented wherever possible using (JSDoc)[https://jsdoc.app/], by add heads to functions, classes and variables. You find many exemples on repository.
+Code from directory `core/frontend` should be executed on web browser, the rest with NodeJS.
+
+### Build
+
+The software is build as `back.cjs` NodeJs CommonJs executable, using Webpack. See below how code is bundled in two steps.
+
 ```
+                                      ────────────┐             
+                    ───┐    static/icons/**       │             
+   core/frontend/**.js │    static/template/**.njk│             
+   core/frontend/**.css├──► front.raw.js          │             
+───────────────────────┘                          │             
+webpack-front.config.mjs    core/i18n.yml         │             
+                            app.js                ├───► back.cjs
+                            ──────────────────────┘             
+                            webpack-back.config.mjs             
+```
+
+Read architecture.md for details about repository files and directories.
 
-## Testing
+### Testing
 
-**Unit testing**: make some asserts on core functions.
+**Unit testing**: make some asserts and documentation about business functions and models.
 Using [Jest](https://jestjs.io/).
 
 ```bash
+npm run test:unit
 npm run test:unit -- --verbose --watchAll
-npm run test:unit -- filename --verbose --watchAll
-npm run test:unit -- --runTestsByPath filepath --verbose --watchAll
+npm run test:unit -- --runTestsByPath <filepath> --verbose --watchAll
 ```
 
-**E2E testing**: generate Cosma's HTML and Markdown files and make some asserts on.
+**E2E testing**: generate Cosma's .html and .md files and make some asserts on.
 Using [Cypress](https://www.cypress.io/).
 
 ```bash
+npm prepare
 sh e2e/exec-modelize.sh
 npm run test:e2e -- --spec "**/graph.cy.js"
 ```
+
+### CI
+
+For each PR and commit at "develop" branch, unit and e2e tests are executed.
+In case of e2e tests fail, you can download .zip contains screenshots and .html files are tested by Cypress.
+
+## Concepts
+
+### Graph
+
+Cosma read files (.md, .csv and .json) to extract _Records_. Each _Record_ contains metadatas (id, title, types, tags…) and links to other _Records_. Links are parsed from files content, as wikilinks `[[link]]` or quotes `@author`. Each _Record_ became a node and links became edges on a graph. This process is made by the software named _Cosmographe_. Cosma finally exports .html file, which is visualization tool for the graph. This file is called _Cosmoscope_.
+
+User give .yml config file contains options to control _Records_ extraction and _Cosmoscope_ display. For exemple, config file contains types for records and links. Cosma will remove unknows types from graph entities.
diff --git a/architecture.md b/architecture.md
new file mode 100644
index 0000000..34d162f
--- /dev/null
+++ b/architecture.md
@@ -0,0 +1,45 @@
+# Repository architecture
+
+## Files tree
+
+List of main files to develop.
+
+```
+.
+├── controllers/
+├── core/
+│   ├── frontend                Web browser files: JS, CSS
+│   ├── models                  Business models and unit tests
+│   ├── utils                   Business functions and unit tests
+│   └── i18n.yml
+├── docs/                       User documentation
+├── e2e/
+│   ├── **/config.yml           Options for each export
+│   ├── exec-modelize.sh        Series of commands to generate exports to execute E2E tests
+│   └── **.cy.js                Cypress E2E testing files
+├── static/
+│   ├── icons                   Images
+│   └── template                Contains app exports (cosmoscope, report) templates
+├── app.js                      Root, CLI commands rooting
+├── webpack-back.config.mjs     Webpack config to build executable (JS+raw)
+├── webpack-front.config.mjs    Webpack config to build frontend bundle (JS+CSS)
+│
+├── temp/                       E2E tests exports
+└── dist/                       Webpack bundles
+    └── back.cjs                App executable
+```
+
+## Published tree
+
+Only next files will be published on NPM on execute `npm publish`.
+
+```
+.
+├── LICENSE
+├── README.md
+├── dist/
+│   └── back.cjs
+├── docs
+├── man
+└── package.json
+```