diff --git a/src/graphics/metal.rs b/src/graphics/metal.rs
index 2e95c4e5..fcc7d0cc 100644
--- a/src/graphics/metal.rs
+++ b/src/graphics/metal.rs
@@ -1248,8 +1248,13 @@ impl RenderingBackend for MetalContext {
         }
     }
 
-    fn delete_shader(&mut self, shader: ShaderId) {}
-    fn delete_pipeline(&mut self, pipeline: Pipeline) {}
+    fn delete_shader(&mut self, shader: ShaderId) {
+        // TODO: place holder
+    }
+    fn delete_pipeline(&mut self, pipeline: Pipeline) {
+        // TODO: place holder
+    }
+
     fn commit_frame(&mut self) {
         unsafe {
             assert!(!self.command_queue.is_null());