diff --git a/etc/TODO.md b/etc/TODO.md
index 3dbbb014f4137638380fa24d677d94e47230e660..0e2efaeb40536aee845e79fcbd443040be5dc97f 100644
--- a/etc/TODO.md
+++ b/etc/TODO.md
@@ -17,3 +17,6 @@
 ### Flask-Login
 * https://flask-login.readthedocs.io/en/latest/
 * https://riptutorial.com/flask/example/28112/using-flask-login-extension
+
+### blueprints
+* https://flask.palletsprojects.com/en/1.1.x/blueprints/