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diff --git a/TODO.md b/TODO.md
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--- a/TODO.md
+++ b/TODO.md
@@ -40,6 +40,9 @@ It's more of a personal reminder than anything else.
 
 ## Technical stuff
 
+### Better pruning tables
+* Use pruning values mod 4 instead of mod 16
+
 ### Code simplification
 * Remove anti-indeces. I think I can do this by using an iterative deepening
   dfs method for generating pruning tables, like I do in solve()