diff --git a/etc/TODO.md b/etc/TODO.md
index b232c17cf442d204ec85c97f35d87e8d2df374f8..0093ff590d9ada2bcbe4f851584d59606a0f4d9e 100644
--- a/etc/TODO.md
+++ b/etc/TODO.md
@@ -66,6 +66,7 @@
 * https://mariadb-corporation.github.io/mariadb-connector-python/
 * https://mariadb.com/docs/clients/connector-python/
 
+* https://jinja.palletsprojects.com/en/2.11.x/templates/
 
 ### git setup
 * https://git-scm.com/book/en/v2/Git-Tools-Submodules