diff --git a/todo.md b/todo.md
index 64a6717..409b6b3 100644
--- a/todo.md
+++ b/todo.md
@@ -8,6 +8,7 @@
 
 ## in future:
 
+* think about scaling
 * add ms-auth roles integration
 * add problem notes
 * add interactive and run-twice problems