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diff --git a/TODO b/TODO
index a44f23d4..81456d39 100644
--- a/TODO
+++ b/TODO
@@ -2,6 +2,7 @@
 === TODO ===
 ============
 
+* Improve efficiency of array operations.
 * Rework subsumption.
 * Finish network communication support.
 * Finish Bemol backend.