diff --git a/.gitignore b/.gitignore
index dc9f166..5d0c9b6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,5 @@ cache/*
 docs/_build
 /vendor/
 /htdocs/vendor/bootstrap/
+composer.lock
+tests/.phpunit.result.cache
diff --git a/docs/installation.rst b/docs/installation.rst
index 23caadc..6e34452 100644
--- a/docs/installation.rst
+++ b/docs/installation.rst
@@ -107,3 +107,19 @@ Start container, mounting that configuration file:
     docker run -p 80:80 \
         -v /home/test/servicedesk.conf.php:/var/www/conf/config.inc.local.php \
         -it docker.io/ltbproject/service-desk:latest
+
+
+From git repository, for developpers only
+-----------------------------------------
+
+You can get the content of git repository
+
+Update composer dependencies:
+
+.. prompt:: bash
+
+   composer update
+
+Depending on your php version, this command will determine the versions of composer dependencies, and create a ``composer.lock`` file. Then it will download these dependencies and put them in vendor/ directory.
+
+Then you can follow the instructions from `From tarball`_, especially the prerequisites.