diff --git a/crates/border-wars/src/hex.rs b/crates/border-wars/src/hex.rs
index 03ae69e..83e3776 100644
--- a/crates/border-wars/src/hex.rs
+++ b/crates/border-wars/src/hex.rs
@@ -9,6 +9,7 @@ use partial_min_max::{max, min};
 
 /// Represents a number that can be used in a hexagonal grid.
 pub trait HexNumber: Signed + PartialEq + Copy + PartialOrd + FromPrimitive {}
+
 impl<T: Signed + PartialEq + Copy + PartialOrd + FromPrimitive> HexNumber for T {}
 
 /// Represents a position in a hexagonal grid.