diff --git a/src/logic/future_moves.rs b/src/logic/future_moves.rs
index 5429a9b..7718f7c 100644
--- a/src/logic/future_moves.rs
+++ b/src/logic/future_moves.rs
@@ -151,12 +151,16 @@ impl FutureMoves {
         depth - 1
     }
 
+    //// PERF! pre-organize all indexes based on what depth they're at
+    /// previously, I did a lookup map based on if a node was visited, still resulted in a full
+    /// O(n) iteration each depth
     fn by_depth(&self, indexes: impl Iterator<Item = usize>) -> Vec<(usize, Vec<usize>)> {
         let mut by_depth: HashMap<
             usize,
             Vec<usize>,
             BuildHasherDefault<nohash_hasher::NoHashHasher<usize>>,
         > = HashMap::with_hasher(BuildHasherDefault::default());
+
         for idx in indexes {
             let depth = self.depth_of(idx);
             if let Some(got) = by_depth.get_mut(&depth) {
@@ -173,9 +177,6 @@ impl FutureMoves {
     /// Compute `Move.value`, propegating upwards from the furthest out Moves
     /// in the Arena.
     fn compute_values(&mut self, indexes: impl Iterator<Item = usize>) {
-        // PERF! pre-organize all indexes based on what depth they're at
-        // previously, I did a lookup map based on if a node was visited, still resulted in a full
-        // O(n) iteration each depth
         let by_depth_vec = self.by_depth(indexes);
 
         // reversed so we build up the value of the closest (in time) moves from the future