diff --git a/TODO.md b/TODO.md
index 0f4b72c..2a21442 100644
--- a/TODO.md
+++ b/TODO.md
@@ -4,3 +4,4 @@
 - Grooming (create a consistent and convenient API)
 - Improve data search
 - Check for TODOs
+- For indexes and partitions: check that the structure attribute exists.