diff --git a/src/logic/future_moves.rs b/src/logic/future_moves.rs
index 4f29b78..884dfa6 100644
--- a/src/logic/future_moves.rs
+++ b/src/logic/future_moves.rs
@@ -172,7 +172,6 @@ impl FutureMoves {
         let mut by_depth: HashMap<usize, Vec<usize>> = HashMap::new();
         for idx in indexes {
             let depth = self.depth_of(idx);
-            // -1 because `depth_of` is one-indexed
             if let Some(got) = by_depth.get_mut(&depth) {
                 got.push(idx);
             } else {