--- a/README.md	Tue Apr 23 20:19:02 2019 +0200
+++ b/README.md	Tue Apr 23 20:24:02 2019 +0200
@@ -17,6 +17,12 @@
 
 ### Installing
 
+Build docker images:
+
+```
+$ docker-compose build
+```
+
 Launch the project
 
 ```