diff --git a/dags/tuto.py b/dags/tuto.py
index cead2b61..8aeda3f3 100644
--- a/dags/tuto.py
+++ b/dags/tuto.py
@@ -10,7 +10,7 @@
 default_args = {
     "owner": "airflow",
     "depends_on_past": False,
-    "start_date": datetime(2015, 6, 1),
+    "start_date": datetime(2020, 12, 2),
     "email": ["airflow@airflow.com"],
     "email_on_failure": False,
     "email_on_retry": False,
diff --git a/docker.md b/docker.md
new file mode 100644
index 00000000..d4caf24e
--- /dev/null
+++ b/docker.md
@@ -0,0 +1,19 @@
+# Useful docker commands
+
+## Docker up
+
+Initially and after code changes:
+
+```
+docker-compose -f docker-compose-LocalExecutor.yml  up -d
+```
+
+## Docker down
+
+To reset the databases: 
+
+the connections need to be created again after a `docker down`.
+
+``` 
+docker-compose -f docker-compose-LocalExecutor.yml down
+```