diff --git a/src/logic/future_moves.rs b/src/logic/future_moves.rs
index 6787ff7..c3690de 100644
--- a/src/logic/future_moves.rs
+++ b/src/logic/future_moves.rs
@@ -65,7 +65,11 @@ impl FutureMoves {
             self.prune_bad_children();
             self.current_depth += 1;
         }
-        assert_eq!(self.current_depth, self.max_depth);
+        assert_eq!(
+            self.current_depth, self.max_depth,
+            "iteration and extention did not extend current_depth ({}) to the max_depth ({})",
+            self.current_depth, self.max_depth
+        );
     }
 
     /// Determines if a [`Move`] at index `idx` is connected to `self.current_root`