diff --git a/build/docker/README.md b/build/docker/README.md
index b7e0045055a..d469c7c7aae 100644
--- a/build/docker/README.md
+++ b/build/docker/README.md
@@ -16,7 +16,7 @@ And then, you can run :
 
         docker-compose up
 
-This will run 3 container Docker : Dolibarr, MariaDB and PhpMyAdmin.
+This will run 4 containers Docker : Dolibarr, MariaDB, PhpMyAdmin and MailDev.
 
 The URL to go to the Dolibarr is :