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diff --git a/TODO.md b/TODO.md
index 0c63ab8..7ab3287 100644
--- a/TODO.md
+++ b/TODO.md
@@ -14,6 +14,9 @@ It's more of a personal reminder than anything else.
 * invert an alg
 
 ### More steps for `solve`
+* "slow" optimal solver, using drud table but all the tricks
+  of khuge (+ trick to avoid 180° moves when one of the inverse
+  probes returns exactly the target value)
 * QTM optimal solving
 * Block-building steps (cross, roux blocks, ...)
 * Other common steps (LSE, ...)