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diff --git a/TODO.md b/TODO.md
index 1478996..76a45bb 100644
--- a/TODO.md
+++ b/TODO.md
@@ -2,6 +2,7 @@
 - [x] Non-hardcoded projection settings
 - [x] Model importing
 - [x] Multiple light sources
+- [ ] Fix the ECS member crate "extension" example
 - [ ] Make ECS framework use archetypes
 - [ ] Add support for entity tags in ECS framework
 - [ ] Add support for adding components to entities at runtime in ECS framework