diff --git a/.gitignore b/.gitignore
index b630057..356b16b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 dev-db/
 database/
-**/.env
\ No newline at end of file
+**/.env
+PostgreSQL/build/*
diff --git a/README.md b/README.md
index c07f236..8f98387 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,14 @@ On aime les briques
 * [Projet: Travail et modalités de rendu Fichier](https://moodle.bordeaux-inp.fr/mod/resource/view.php?id=48191)
 * [Sujet : Briques Fichier](https://moodle.bordeaux-inp.fr/mod/resource/view.php?id=132493)
 
+## Generating data
+
+To use the script `generate_data.py`, do :
+
+1) `cd PostgreSQL/`
+2) `rm -fr build/*` (don't remove the directory, just the files in it.)
+3) `python generate_data.py`
+
 ## Dev
 
 To run postgresql server + adminer in dev environnement (assuming you're running the backend manually with node), run :