diff --git a/SiD/compact/SiD_o2_v03/README.md b/SiD/compact/SiD_o2_v03/README.md
index 69186facc..248b6e287 100644
--- a/SiD/compact/SiD_o2_v03/README.md
+++ b/SiD/compact/SiD_o2_v03/README.md
@@ -1 +1,6 @@
 Version #3 of the SiD option #2 model, with corresponding drivers making use of the new TrackingCellIDEncoding string.
+
+To do:
+- clean up all XMLs
+- make sure encoding is the the same across all Tracking + Vertex detectors
+- update or rewrite the corresponding barrel and endcap drivers (and allow 2 sensitive slices)