diff --git a/contrib/database/index.md b/contrib/database/index.md
index 56cd85b..2d57e4d 100644
--- a/contrib/database/index.md
+++ b/contrib/database/index.md
@@ -1,3 +1,4 @@
 # List of sections
 
 - [Introduction to MySQL and Queries](intro_mysql_queries.md)
+- [SQLAlchemy and Aggregation Functions](sqlalchemy_aggregation.md)