diff --git a/.gitignore b/.gitignore
index 356b16b..46423bd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,4 @@
 dev-db/
 database/
 **/.env
-PostgreSQL/build/*
+*.data
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..d26152d
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,14 @@
+DIR_SQL	 = PostgreSQL
+DIR_BACK = back-end
+
+BIN = prepare_dev
+
+all: $(BIN)
+
+prepare_dev:
+	cp $(DIR_BACK)/.env.example $(DIR_BACK)/.env
+
+clean:
+	rm -f $(DIR_BACK)/.env
+	cd $(DIR_SQL) && make clean
+
diff --git a/PostgreSQL/Makefile b/PostgreSQL/Makefile
index 23784b2..27db067 100644
--- a/PostgreSQL/Makefile
+++ b/PostgreSQL/Makefile
@@ -1,5 +1,5 @@
-DIR_SRC=src
-DIR_BUILD=build
+DIR_SRC   = src
+DIR_BUILD = build
 
 BIN = 00_drop.sql 01_create.sql 02_insert.sql \
 	  03_select.sql 04_update.sql
diff --git a/README.md b/README.md
index 8f98387..d3a6780 100644
--- a/README.md
+++ b/README.md
@@ -9,18 +9,18 @@ On aime les briques
 
 ## 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`
+```
+cd PostgreSQL/
+make generate_data
+```
 
 ## Dev
 
 To run postgresql server + adminer in dev environnement (assuming you're running the backend manually with node), run :
 
 ```
-cp back-end/.env.example back-end/.env
+cd free-briques/
+make
 docker compose -f docker-compose.dev.yml up
 ```