diff --git a/src/game.rs b/src/game.rs
index 85261fa..5b1889c 100644
--- a/src/game.rs
+++ b/src/game.rs
@@ -774,6 +774,9 @@ impl Game {
         new_id
     }
 
+    /// todo I think I need a generic `dedupe(&mut self, Vec<T>)` function
+    /// it would have to take a closure for comparing a given T (see the background_tile below)
+    /// and a closure for what to do with the changed IDs
     pub fn dedupe_tiles(&mut self) {
         let mut tiles_temp = self.tiles.clone();
         let mut unique_tiles: Vec<Tile> = Vec::new();