diff --git a/src/main.rs b/src/main.rs
index 73f0e36..d30ee8e 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -22,10 +22,17 @@ fn spawn_snake(commands: &mut Commands, materials: Res<Materials>) {
         .with(SnakeHead);
 }
 
+fn snake_movement(mut head_positions: Query<(&SnakeHead, &mut Transform)>) {
+    for (_head, mut transform) in head_positions.iter_mut() {
+        transform.translation.y += 2.;
+    }
+}
+
 fn main() {
     App::build()
         .add_startup_system(setup.system())
         .add_startup_stage("game_setup", SystemStage::single(spawn_snake.system()))
+        .add_system(snake_movement.system())
         .add_plugins(DefaultPlugins)
         .run();
 }