Update README.md

README.md

@@ -116,6 +116,17 @@ emacs gas/locale/fr/LC_MESSAGES/django.po # (or install gettext extension of cho
 django-admin compilemessages
 ```
 
+## DB Migrations
+[Django documentation](https://docs.djangoproject.com/en/2.2/ref/django-admin/#migrate)
+tl;dr
+```bash
+django-admin migrate portal [migration_name]
+```
+If migration_name is omitted, **ALL** migrations will be applied.
+Specify a migration_name to apply migrations **up to that one and no further**
+This can be used to un-apply a migration.
+
+
 ## Links to various resources used in this project
 
 [Private Storage](https://pypi.org/project/django-private-storage/)