diff --git a/TODO.md b/TODO.md
index 0e69f4d..8c1a36d 100644
--- a/TODO.md
+++ b/TODO.md
@@ -39,6 +39,10 @@ Importance:
   - Only the head-buffer needs to be fully traversed (N)
   - If aggregating over hwthreads/cores/sockets cache those results and reuse
     some of that for new queries aggregating only over the newer data (W)
+- Core functionality
+  - Implement a health checker component that provides information to the web
+    interface and REST API (I)
+  - Support units for metrics including to request unit conversions (I)
 - Compression
   - Enable compression for http API requests (N)
   - Enable compression for checkpoints/archive (I)