diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 2bd9e7e..eea8389 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -23,3 +23,9 @@ To run tests locally, just launch:
 ```
 poetry run python manage.py test
 ```
+
+## Generate the SQL schema image
+
+```
+poetry run python manage.py graph_models -a -X ContentType,LogEntry,AbstractUser,AbstractBaseSession,Group,Permission,Success,Failure,Task,Schedule,OrmQ,User,Session -o docs/2024-09-22_price-schema.png
+```
diff --git a/config/settings.py b/config/settings.py
index 54f6dbe..62dfc52 100644
--- a/config/settings.py
+++ b/config/settings.py
@@ -244,7 +244,8 @@
     MIDDLEWARE += ["debug_toolbar.middleware.DebugToolbarMiddleware"]
 
 
-# Shell Plus (django-extensions)
+# Django-extensions
+# https://django-extensions.readthedocs.io/
 # ------------------------------------------------------------------------------
 
 SHELL_PLUS = "ipython"
diff --git a/docs/2024-09-22_price-schema.png b/docs/2024-09-22_price-schema.png
new file mode 100644
index 0000000..cf7a1d8
Binary files /dev/null and b/docs/2024-09-22_price-schema.png differ